| | 500 | pure sciences | |
| | 500 | science |  |
| ↑ | 500 | sciences generally | |   |
| ↑ | 501 | philosophy of science |  → 001.4 ≈ ZE.0 S.SPEC.38.DC | |
| ↑ | 502 | professions and materials | | |
| ↑ | 502.8 | techniques, devices, equipment | | |
| ↑ | 502.82 | microscopy | | |
| ↑ | 503 | scientific dictionaries and encyclopedias | → 423 603 | |
| ↑ | 506 | scientific organizations and management | | |
| ↑ | 507 | science didactics, textbooks at Botta 2 | → 370 510.7 ≈ T.6 | |
| ↑ | 509 | history of science | ≈ D.1 31E | |
| | 510 | mathematics | |
| ↑ | 510 | mathematics generally | ≈ 60E | |
| ↑ | 510.1 | philosophy of mathematics | → 160 | |
| ↑ | 510.21 | mathematics tables | → 515.021 | |
| ↑ | 510.28 | techniques and devices for mathematics | | |
| ↑ | 510.285 | computers in mathematics | → 005.72 519.4 | |
| ↑ | 510.7 | mathematics teaching | → 370 507 793.74 ≈ T.5 | |
| ↑ | 510.9 | history of mathematics | ≈ D.2 | |
| ↑ | 511 | general principles of mathematics | ≈ E.0 | |
| ↑ | 511.3 | mathematical logic, computability | → 005.1 ≈ E.1 | |
| ↑ | 511.32 | sets | ≈ E.2 | |
| ↑ | 511.35 | recursitivy, cellular automata, λ calculus | | |
| ↑ | 511.4 | approximations, error | → 518.5 ≈ I.9 | |
| ↑ | 511.5 | graph theory | ≈ F.1 | |
| ↑ | 511.6 | combinatorics | ≈ F.0 | |
| ↑ | 512 | algebra | ≈ G.0 AL1 | |
| ↑ | 512.2 | group theory | ≈ G.9 | |
| ↑ | 512.3 | field theory | ≈ G.3 | |
| ↑ | 512.4 | rings | ≈ G.6 | |
| ↑ | 512.482 | Lie algebras and groups | ≈ M.3 | |
| ↑ | 512.5 | linear algebra | ≈ G.5 | |
| ↑ | 512.6 | category theory, homological algebra, K theory | ≈ G.8 | |
| ↑ | 512.7 | number theory | ≈ H.0 | |
| ↑ | 512.72 | elementar number theory | ≈ H.1 | |
| ↑ | 512.74 | algebraic number theory | ≈ H.2 | |
| ↑ | 512.75 | geometry of numbers | ≈ H.2 | |
| ↑ | 512.9 | foundations of algebra, logarithms | | |
| ↑ | 514 | topology | ≈ L.0 L.1 | |
| ↑ | 514.2 | algebraic topology | ≈ L.2 | |
| ↑ | 514.7 | analytical, differential, global topology | ≈ L.3 | |
| ↑ | 514.74 | global analysis, fractals | ≈ M.1 | |
| ↑ | 515 | calculus | → 518.6 ≈ I.0 | |
| ↑ | 515.021 | tables of calculus | → 510.21 ≈ I.99 | |
| ↑ | 515.07 | exercises in analysis | ≈ I.98 | |
| ↑ | 515.2 | general aspects of calculus | | |
| ↑ | 515.24 | sequences and series, Fourier analysis | ≈ I.8 I.10 | |
| ↑ | 515.3 | differential calculus | ≈ I.13 | |
| ↑ | 515.35 | differential equations | | |
| ↑ | 515.352 | ordinary differential equations, ODEs | → 518.63 ≈ I.14 | |
| ↑ | 515.353 | partial differential equations, PDEs | ≈ I.15 | |
| ↑ | 515.355 | nonlinear differential equations | | |
| ↑ | 515.39 | dynamical systems, chaos | → 003.7 ≈ I.14 | |
| ↑ | 515.4 | integral calculus, integral equations | | |
| ↑ | 515.42 | measure and integration theory | ≈ I.3 | |
| ↑ | 515.45 | integral equations | ≈ I.17 | |
| ↑ | 515.5 | special functions | ≈ I.7 | |
| ↑ | 515.6 | other analytical methods | | |
| ↑ | 515.62 | finite differences | ≈ I.16 | |
| ↑ | 515.64 | calculus of variations | ≈ I.19 | |
| ↑ | 515.7 | functional analysis | ≈ I.18 | |
| ↑ | 515.72 | operator calculus, transforms | ≈ I.12 | |
| ↑ | 515.75 | functional equations | ≈ I.16 | |
| ↑ | 515.785 | abstract harmonic calculus | ≈ I.11 | |
| ↑ | 515.8 | real variable functions | ≈ I.2 | |
| ↑ | 515.9 | complex variable functions | | |
| ↑ | 515.93 | functions of one complex variable | ≈ I.4 | |
| ↑ | 515.94 | functions of several complex variables | ≈ I.6 | |
| ↑ | 515.96 | potential theory | ≈ I.5 | |
| ↑ | 516 | geometry | ≈ J.0 | |
| ↑ | 516.08 | convex sets | ≈ J.2 | |
| ↑ | 516.3 | analytical geometries | | |
| ↑ | 516.35 | algebraic geometry | ≈ K.0 | |
| ↑ | 516.353 | several-dimension algebraic manifolds | ≈ K.3 K.4 | |
| ↑ | 516.36 | differential and integral geometry | → 531 ≈ M.2 | |
| ↑ | 516.5 | projective geometry | ≈ J.1 | |
| ↑ | 516.6 | abstract descriptive geometry | ≈ J.1 | |
| ↑ | 516.9 | non-Euclidean geometries | | |
| ↑ | 518 | numerical analysis | → 519.4 | |
| ↑ | 518.4 | numerical methods in algebra and in number theory | ≈ O.3 | |
| ↑ | 518.5 | numerical approximation | → 511.4 ≈ O.2 | |
| ↑ | 518.6 | numerical methods in analysis | → 3 515 | |
| ↑ | 518.63 | numerical solutions of ordinal differential equations | → 515.352 ≈ O.4 | |
| ↑ | 518.64 | numerical solutions of partial differential equations | → 515.353 ≈ O.5 | |
| ↑ | 519 | probability, statistics, applied maths | → 610.72 ≈ N.0 S.SPEC.42.GB | |
| ↑ | 519.2 | probability | ≈ N.1 | |
| ↑ | 519.23 | stochastic processes, Markov chains, martingales | | |
| ↑ | 519.3 | game theory | ≈ R.2 | |
| ↑ | 519.4 | applied numerical analysis, finite elements, MATLAB | → 4 510.285 518 | |
| ↑ | 519.5 | mathematical statistics | → 310 338.54 ≈ N.2 | |
| ↑ | 519.53 | descriptive statistics, multivariate analysis | → 658.403 | |
| ↑ | 519.54 | statistical inference | → 006.31 | |
| ↑ | 519.55 | time series analysis | | |
| ↑ | 519.6 | mathematical optimization | → 3 ≈ O.7 OM1 | |
| ↑ | 519.7 | programming theory, operations research | → 005.1 658.4 ≈ R.1 | |
| ↑ | 519.8 | mathematical methods of sciences | → 330.0151 368 530.15 ≈ Q.0 | |
| | 520 | astronomy | |
| ↑ | 520 | astronomy generally | | |
| ↑ | 523.44 | asteroids | ≈ 10H | |
| ↑ | 526 | mathematical geography, topography | → 711 912 | |
| ↑ | 526.9 | surveying | → 006.37 550.28 | |
| | 530 | physics | |
| ↑ | 530 | physics in general | → 612.014 ≈ 60D | |
| ↑ | 530.021 | physics tables | | |
| ↑ | 530.092 | physicists | | |
| ↑ | 530.1 | theoretical and mathematical physics | ≈ 60C | |
| ↑ | 530.11 | relativity | ≈ ZA.6 | |
| ↑ | 530.12 | quantum physics | ≈ ZA.8 | |
| ↑ | 530.13 | statistical mechanics | → 536.7 ≈ ZA.10 | |
| ↑ | 530.14 | fields and waves | → 621.3813 | |
| ↑ | 530.15 | mathematical physics | → 519.8 531 ≈ ZA.0 | |
| ↑ | 530.4 | states of matter | | |
| ↑ | 530.41 | solid state physics | | |
| ↑ | 530.415 | mass diffusion and transfer | | |
| ↑ | 530.42 | liquid state physics | → 532 | |
| ↑ | 530.44 | plasma and ionized gas physics | | |
| ↑ | 530.8 | measurement | → 681.2 | |
| ↑ | 531 | classical mechanics, continuum mechanics | → 516.36 530.15 620.1 ≈ ZA.1 | |
| ↑ | 531.1 | mechanics, statics | | |
| ↑ | 531.16 | particle mechanics | ≈ ZA.2 | |
| ↑ | 531.3 | solid dynamics | → 624 ≈ ZA.3 | |
| ↑ | 531.6 | energy | | |
| ↑ | 532 | fluid mechanics | → 530.42 551.48 ≈ ZA.4 | |
| ↑ | 532.05 | fluid dynamics | → 551.303 | |
| ↑ | 533 | gas mechanics | | |
| ↑ | 534 | sound and vibrations | → 620.2 | |
| ↑ | 535 | optics | → 621.36 ≈ ZA.7 | |
| ↑ | 535.2 | physical optics, nonlinear optics | | |
| ↑ | 535.8 | optical spectroscopy in infrared and ultraviolet | | |
| ↑ | 536 | thermology | | |
| ↑ | 536.5 | temperature | | |
| ↑ | 536.56 | cryogeny, low temperatures | | |
| ↑ | 536.7 | thermodynamics | → 530.13 541.369 621.4 ≈ ZA.5 | |
| ↑ | 537 | electromagnetism | → 621.3 ≈ ZA.7 | |
| ↑ | 537.535 | X and gamma rays electronics | → 539.722 | |
| ↑ | 537.62 | conductivity and electric resistance | | |
| ↑ | 538 | magnetism | | |
| ↑ | 538.36 | magnetic resonance | → 610.28 | |
| ↑ | 538.362 | NMR: nuclear magnetic resonance | | |
| ↑ | 538.364 | EPR: electronic paramagnetic resonance | | |
| ↑ | 539 | modern physics | | |
| ↑ | 539.2 | radiations | → 621.382 | |
| ↑ | 539.7 | atomic and nuclear physics | → 621.48 ≈ ZA.9 | |
| ↑ | 539.72 | particle physics, ionizing radiations | | |
| ↑ | 539.721 | neutrons and other particles | | |
| ↑ | 539.722 | ionizing radiations, X, gamma and cosmic rays | → 537.535 | |
| ↑ | 539.75 | nuclear interactions, radioactivity | | |
| ↑ | 539.77 | particle and radioactivity detection and measure | | |
| | 540 | chemistry | |
| ↑ | 540 | chemistry in general | → 016.54 660.28 ≈ 59A S.SPEC.36.CB | |
| ↑ | 540.14 | nomenclature | | |
| ↑ | 540.2 | miscellaneous works in chemistry | | |
| ↑ | 540.7 | education and research in chemistry | | |
| ↑ | 540.76 | exercice and auxiliary books in chemistry | | |
| ↑ | 540.9 | history of chemistry | | |
| ↑ | 540.92 | biographies of chemists | | |
| ↑ | 541 | physical chemistry | → 660.29 ≈ 60A | |
| ↑ | 541.042 | matter state chemistry, solid state | | |
| ↑ | 541.2 | theoretic chemistry | | |
| ↑ | 541.22 | molecular structure | ≈ 60B | |
| ↑ | 541.220 | formulas, specifications | | |
| ↑ | 541.223 | stereochemistry | | |
| ↑ | 541.224 | chemical bonds, valency, radicals | | |
| ↑ | 541.2242 | coordination compounds, blenders | | |
| ↑ | 541.26 | stoichiometry | | |
| ↑ | 541.28 | quantum chemistry | | |
| ↑ | 541.3 | various subects in physical chemistry | | |
| ↑ | 541.33 | surface chemistry, adsorption, adhesion | | |
| ↑ | 541.34 | chemistry of solutions, colloids | | |
| ↑ | 541.345 | colloid chemistry | ≈ 59H | |
| ↑ | 541.348 | solvents | | |
| ↑ | 541.35 | photochemistry | | |
| ↑ | 541.36 | thermochemistry | | |
| ↑ | 541.363 | state changes, phase transformations | | |
| ↑ | 541.368 | reactions at extreme temperatures | | |
| ↑ | 541.369 | chemical thermodynamics | → 536.7 | |
| ↑ | 541.37 | electrochemistry, magnetochemistry | | |
| ↑ | 541.372 | electrolytic solutions | | |
| ↑ | 541.378 | magnetochemistry | | |
| ↑ | 541.38 | radiochemistry | | |
| ↑ | 541.388 | isotopes | | |
| ↑ | 541.39 | chemical reactions | | |
| ↑ | 541.392 | chemical equilibrium | | |
| ↑ | 541.393 | oxydo-reduction | | |
| ↑ | 541.394 | chemical kinetics | | |
| ↑ | 541.395 | catalysis | | |
| ↑ | 542 | laboratory techniques, computational chemistry | → 6 | |
| ↑ | 542.8 | auxiliary and electronic facilities, data processing | | |
| ↑ | 543 | analytical chemistry | ≈ 59B | |
| ↑ | 543.08 | spectroscopy, chromatography [outdated number] | | |
| ↑ | 543.1 | bromatological analysis | ≈ S.SPEC.36.CC | |
| ↑ | 543.17 | organic analytical chemistry | | |
| ↑ | 543.2 | classical methods | ≈ 59D | |
| ↑ | 543.22 | microchemistry | ≈ 59C | |
| ↑ | 543.24 | volumetric analysis | | |
| ↑ | 543.26 | thermal analysis | | |
| ↑ | 543.4 | electrochemical analysis | | |
| ↑ | 543.5 | optical spectroscopy | | |
| ↑ | 543.6 | non-optical spectroscopy | | |
| ↑ | 543.63 | radiochemical analysis | | |
| ↑ | 543.8 | chromatography | | |
| ↑ | 543.84 | liquid-mobile phase chromatography | | |
| ↑ | 543.85 | gas chromatography | | |
| ↑ | 546 | inorganic chemistry | → 551.9 572.51 | |
| ↑ | 546.2 | hydrogen and its compounds | | |
| ↑ | 546.24 | acids | | |
| ↑ | 546.3 | metals, metallic compounds, alloys | → 620.16 669 | |
| ↑ | 546.34 | salts | | |
| ↑ | 546.4 | group 3, lantanids, actinids | | |
| ↑ | 546.41 | lantanids, rare earths | | |
| ↑ | 546.42 | actinids | | |
| ↑ | 546.5 | groups 4 to 7: of titanium, vanadium, chrome, manganese | | |
| ↑ | 546.6 | groups 8 to 14 | | |
| ↑ | 546.625 | nickel | | |
| ↑ | 546.671 | boron | | |
| ↑ | 546.7 | groups 15 to 18: chalcogens, alogens, noble gases | | |
| ↑ | 546.8 | periodic law and table | | |
| ↑ | 547 | organic chemistry | ≈ 59G | |
| ↑ | 547.002 | techniques, devices, equipment | | |
| ↑ | 547.007 | exercices and auxiliary materials in organic chemistry | | |
| ↑ | 547.01 | hydrocarbons | → 547.41 | |
| ↑ | 547.02 | halogenated compounds | | |
| ↑ | 547.04 | nitrogen compounds | | |
| ↑ | 547.05 | organometallic compounds | | |
| ↑ | 547.06 | sulphur organic compounds | | |
| ↑ | 547.1 | physical and theoretical organic chemistry | | |
| ↑ | 547.122 | molecular structures, stereochemistry, bonds | | |
| ↑ | 547.128 | quantum chemistry | | |
| ↑ | 547.135 | photochemistry | | |
| ↑ | 547.137 | electrochemistry, magnetochemistry | | |
| ↑ | 547.2 | organic reactions | | |
| ↑ | 547.23 | oxydoreduction | | |
| ↑ | 547.28 | polymerization | | |
| ↑ | 547.4 | aliphatic compounds | | |
| ↑ | 547.41 | hydrocarbons | → 547.01 | |
| ↑ | 547.413 | acetylenes, alchines | | |
| ↑ | 547.5 | cyclic compounds | | |
| ↑ | 547.59 | heterocycles | | |
| ↑ | 547.593 | heteronitrogen compounds, clorophillae, diazines, imidazolos | | |
| ↑ | 547.6 | aromatic compounds | | |
| ↑ | 547.7 | macromolecules, polymers | → 620.19 668.9 | |
| ↑ | 547.71 | terpenes and essential oils | | |
| ↑ | 547.77 | lipids | | |
| ↑ | 547.78 | carbohydrates | | |
| ↑ | 547.8 | other organic substances | | |
| ↑ | 547.84 | elastomers, resins, lignin | | |
| ↑ | 547.86 | colourants and pigments | | |
| ↑ | 548 | crystallography | ≈ 47A 47C | |
| ↑ | 548.021 | formulas | | |
| ↑ | 548.3 | crystallochemistry | ≈ 48BC 58E | |
| ↑ | 548.5 | crystallization | | |
| ↑ | 548.7 | mathematical crystallography | ≈ 48BD | |
| ↑ | 548.8 | physical and structural crystallography | ≈ 47B 47H | |
| ↑ | 548.81 | structural crystallography | | |
| ↑ | 548.83 | diffractometric methods | | |
| ↑ | 548.9 | optical crystallography | ≈ 47F 48B | |
| ↑ | 549 | mineralogy | → 552 ≈ 25B 44C | |
| ↑ | 549.1 | determinative mineralogy | ≈ 49F 49H | |
| ↑ | 549.6 | silicates | ≈ 45H | |
| ↑ | 549.67 | phyllosilicates, clay minerals | → 553.6 ≈ 32G | |
| ↑ | 549.9 | geography of minerals | ≈ 45B 45C | |
| | 550 | Earth science | |
| ↑ | 550 | Earth science in general | | |
| ↑ | 550.11 | models in Earth science | ≈ 18B | |
| ↑ | 550.28 | remote sensing | → 006.6 526.9 621.367 910.28≈ 17C OE11 | |
| ↑ | 551 | geology and hydrology | → 622 ≈ ZA.12 30AR | |
| ↑ | 551.023 | geologist as a profession | | |
| ↑ | 551.072 | geological survey | → 912 ≈ 17B 21A | |
| ↑ | 551.1 | Earth structure and properties | ≈ 19A 24A | |
| ↑ | 551.2 | volcanoes, earthquakes, thermal water and gases | → 904.5 | |
| ↑ | 551.21 | volcanology | ≈ 21F | |
| ↑ | 551.22 | seismology, earthquakes | → 620.3 624.176 ≈ 21E 24B | |
| ↑ | 551.23 | thermal water and gases | ≈ 23E 31G | |
| ↑ | 551.3 | surface processes, rock fall, landslides | → 624.151 631.4 ≈ 20D 32E | |
| ↑ | 551.303 | sediment transportation and deposit | → 532.05 627.1 | |
| ↑ | 551.31 | glaciology | ≈ 13D | |
| ↑ | 551.4 | geomorphology and hydrosphere | | |
| ↑ | 551.41 | geomorphology | → 910.02 ≈ 12A GE4 | |
| ↑ | 551.46 | oceanography, underwater geology | ≈ 11B | |
| ↑ | 551.48 | hydrology, surface waters | → 532 627 ≈ 10B | |
| ↑ | 551.483 | rivers, streams | | |
| ↑ | 551.489 | floods | | |
| ↑ | 551.49 | hydrogeology, ground waters | → 628.1 ≈ 10A | |
| ↑ | 551.5 | meteorology | ≈ S.SPEC.39.EA | |
| ↑ | 551.6 | climatology, weather | ≈ 13A | |
| ↑ | 551.7 | historical geology | ≈ 17D 19B | |
| ↑ | 551.8 | structural geology | ≈ 18A 19C | |
| ↑ | 551.9 | geochemistry | → 546 ≈ 10I 25A | |
| ↑ | 552 | petrology | → 549 ≈ 25B | |
| ↑ | 552.06 | rock composition, structure and analysis | ≈ 10C 10E | |
| ↑ | 552.1 | igneous rocks | | |
| ↑ | 552.4 | metamorphic rocks | | |
| ↑ | 552.5 | sedimentary rocks | ≈ 29A 31A | |
| ↑ | 553 | economic and applied geology, layers | → 622 ≈ 23B 23C | |
| ↑ | 553.2 | hydrocarbons, fuels | ≈ 23A 23D | |
| ↑ | 553.6 | clays, sands, salts | → 549.67 ≈ 32H | |
| ↑ | 553.7 | water | | |
| ↑ | 554 | Earth sciences of Europe | ≈ 15A 30AB | |
| ↑ | 554.5 | Earth sciences of Italy | ≈ 15B 16B | |
| ↑ | 554.51 | Earth sciences of Northern Italy and the Alps | ≈ 16A 30C | |
| ↑ | 555 | Earth sciences of Asia | ≈ 14A | |
| ↑ | 556 | Earth sciences of Africa | ≈ 14A 30F | |
| ↑ | 557 | Earth sciences of Northern America | ≈ 14A | |
| ↑ | 558 | Earth sciences of Southern America | ≈ 14A | |
| ↑ | 559 | Earth sciences of Antarctica and islands | ≈ 14A | |
| | 560 | palaeontology | |
| ↑ | 560 | palaeobiology in general | ≈ 26A 31D | |
| ↑ | 561 | palaeobotany and micropalaeontology | ≈ S.SPEC.40.ED 26B | |
| ↑ | 562 | invertebrate palaeontology | ≈ 27A 27B | |
| ↑ | 567 | fossil fishes, amphibians and reptiles | ≈ 28B | |
| ↑ | 568 | fossil birds | ≈ 28B | |
| ↑ | 569 | fossil mammals | ≈ 28B | |
| ↑ | 569.9 | fossil hominids | → 599.9 | |
| | 570 | biology | |
| ↑ | 570 | general biology | ≈ S.SPEC.30.BC | |
| ↑ | 570.12 | biological systematics | | |
| ↑ | 570.28 | biological techniques and equipments | | |
| ↑ | 570.285 | bioinformatics, computational biology | | |
| ↑ | 570.9 | history of biology | | |
| ↑ | 570.92 | biologists | | |
| ↑ | 571 | physiology in general | → 612 | |
| ↑ | 571.1 | animal physiology | ≈ S.SPEC.29.BB | |
| ↑ | 571.2 | plant and microrganism physiology | → 581 ≈ S.SPEC.35.CA | |
| ↑ | 571.3 | comparative anatomy | → 611 | |
| ↑ | 571.31 | animal anatomy | → 591 | |
| ↑ | 571.5 | histology | → 611.018 ≈ S.SPEC.29.BA | |
| ↑ | 571.6 | cell biology | → 572.8 611.018 ≈ S.SPEC.29.BA | |
| ↑ | 571.63 | anatomy, morphology, biophysics, cell culture | | |
| ↑ | 571.64 | membranes | | |
| ↑ | 571.65 | cytoplasm | | |
| ↑ | 571.8 | reproduction, development, embryology | → 612.64 | |
| ↑ | 571.9 | general pathology | → 616 | |
| ↑ | 571.93 | diseases in general | | |
| ↑ | 571.96 | immunology | | |
| ↑ | 571.978 | carcinogenesis | → 616.99 | |
| ↑ | 571.99 | parassitology | → 616.96 616.98 | |
| ↑ | 572 | biochemistry | → 612.015 660.6 ≈ 59I S.SPEC.36.CB | |
| ↑ | 572.2 | biochemistry of plants and microorganisms | → 581 | |
| ↑ | 572.4 | metabolism | | |
| ↑ | 572.49 | fermentation | → 663 | |
| ↑ | 572.5 | various chemical substances | | |
| ↑ | 572.51 | bioinorganic chemistry, trace elements | → 546 | |
| ↑ | 572.56 | carbohydrates | | |
| ↑ | 572.58 | vitamins | | |
| ↑ | 572.6 | proteins | | |
| ↑ | 572.65 | protein components | | |
| ↑ | 572.7 | enzymes | | |
| ↑ | 572.8 | molecular biology, biochemical genetics | → 571.6 576.5 | |
| ↑ | 572.86 | DNA, genomics | | |
| ↑ | 573 | specific systems | | |
| ↑ | 573.4 | endocrinology | | |
| ↑ | 576 | genetics, evolution | → 579 599.93 | |
| ↑ | 576.5 | general genetics | → 572.8 581.3 591.3 599.93≈ S.SPEC.29.BB | |
| ↑ | 576.54 | variation, mutation | | |
| ↑ | 576.58 | population genetics | → 577.8 | |
| ↑ | 576.8 | evolution | ≈ S.SPEC.27.AQ | |
| ↑ | 576.83 | origins of life | | |
| ↑ | 577 | ecology | → 304.2 333.95 344 363.7 | |
| ↑ | 577.6 | hydrobiology, freshwater ecology | ≈ S.SPEC.32.BI | |
| ↑ | 577.8 | synecology, population biology | → 576.58 719 | |
| ↑ | 577.85 | symbiosis and parasitism | | |
| ↑ | 578 | natural history | | |
| ↑ | 578.62 | alien, invasive species | | |
| ↑ | 578.77 | marine biology | | |
| ↑ | 579 | microbiology, fungus, algae | → 576 616.01 ≈ S.SPEC.26.AM S.SPEC.30.BE | |
| ↑ | 579.2 | virology | → 616.91 ≈ S.SPEC.32.BG | |
| ↑ | 579.3 | prokaryotes, bacteria | → 616.92 632.32 | |
| ↑ | 579.4 | protozoans | | |
| ↑ | 579.5 | fungus, mycology | → 616.969 ≈ MICOL. Sez.Mic | |
| ↑ | 579.52 | | | |
| ↑ | 579.53 | | → 581.2 | |
| ↑ | 579.54 | | | |
| ↑ | 579.55 | | | |
| ↑ | 579.56 | | | |
| ↑ | 579.563 | | → 664 | |
| ↑ | 579.57 | | | |
| ↑ | 579.59 | | | |
| ↑ | 579.6 | mushrooms | | |
| ↑ | 579.7 | | | |
| ↑ | 579.8 | algae | ≈ S.SPEC.19.AA | |
| | 580 | botany | |
| ↑ | 580 | botany in general | → 630 ≈ S.SPEC.20.AC | |
| ↑ | 580.12 | systematic botany | ≈ S.FLORE.G | |
| ↑ | 580.73 | botanical gardens | ≈ S.SPEC.20.AB | |
| ↑ | 580.74 | botanical museums, herbariums | | |
| ↑ | 580.9 | history of botany | ≈ S.SPEC.20.AB | |
| ↑ | 581 | plant characters, genetics and ecology | → 571.2 572.2 | |
| ↑ | 581.092 | botanists | | |
| ↑ | 581.3 | plant genetics and physiology | → 576.5 631.52 | |
| ↑ | 581.6 | plant uses and effects | | |
| ↑ | 581.634 | medicinal plants | → 615.321 | |
| ↑ | 581.7 | plants of special environments, plant ecology | → 577 ≈ S.SPEC.24.AH | |
| ↑ | 581.753 | mountain, Alpine plants | | |
| ↑ | 581.9 | phytogeography, floras | ≈ S.SPEC.24.AH S.FLORE | |
| ↑ | 581.94 | plants of Europe | ≈ S.FLORE.H S.FLORE.I | |
| ↑ | 581.943 | plants of Germany and Central Europe | | |
| ↑ | 581.944 | plants of France | | |
| ↑ | 581.945 | plants of Italy | ≈ S.FLORE.C | |
| ↑ | 581.9451 | plants of NW Italy | | |
| ↑ | 581.9452 | plants of Lombardy | | |
| ↑ | 581.9454 | plants of Emilia-Romagna | | |
| ↑ | 581.947 | plants of Russia | | |
| ↑ | 581.95 | plants of Asia | ≈ S.FLORE.F | |
| ↑ | 581.955 | plants of Iran | ≈ S.FLORE.M | |
| ↑ | 581.96 | plants of Africa | ≈ S.FLORE.L | |
| ↑ | 581.97 | plants of North and Central America | ≈ S.FLORE.M S.SPEC.41.FC | |
| ↑ | 581.98 | plants of South America | ≈ S.FLORE.N S.SPEC.41.FB | |
| ↑ | 582 | phanerogams, spermatophytes | → 635.9 | |
| ↑ | 582.0463 | flowers and their parts | ≈ S.SPEC.28.AR | |
| ↑ | 582.13 | flowers | → 635.9 | |
| ↑ | 582.16 | trees | | |
| ↑ | 586 | cryptogams | ≈ S.SPEC.25.AL S.SPEC.26.AN | |
| | 590 | zoology | |
| ↑ | 590 | zoology in general | ≈ S.SPEC.31.BE | |
| ↑ | 591 | animal biology | → 571.31 | |
| ↑ | 591.3 | animal genetics | → 576.5 | |
| ↑ | 591.5 | ethology, animal behaviour | → 304.5 | |
| ↑ | 591.513 | animal intelligence | → 153 | |
| ↑ | 591.59 | animal communication | | |
| ↑ | 592 | lower invertebrates, worms | | |
| ↑ | 594 | molluscs | | |
| ↑ | 595 | entomology, arthropods | → 614.17 632.7 | |
| ↑ | 595.7 | insects | | |
| ↑ | 596 | chordates, vertebrates in general | | |
| ↑ | 597 | cold-blooded vertebrates, fish | | |
| ↑ | 597.9 | amphibians and reptiles | | |
| ↑ | 598 | birds | | |
| ↑ | 599 | mammals | | |
| ↑ | 599.3 | rodents, insectivores, lagomorphs | | |
| ↑ | 599.6 | ungulates | | |
| ↑ | 599.7 | carnivores | | |
| ↑ | 599.8 | primates, monkeys | | |
| ↑ | 599.9 | humans, physical anthropology | → 320 569.9 | |
| ↑ | 599.93 | human genetics and evolution | → 576 | |
| ↑ | 599.935 | human genetics | → 320 576.5 616.04 | |
