| ↑ | A I | history of architecture |   ≈ 720.92 724 |   |
| ↑ | A V | architectural composition | ≈ 729.1 | |
| | A.1 | Ophthalmology | |
| | A.1 | Bibliographic introductions, bibliographies, library catalogues | |
| ↑ | A.10 | Manuals | → ≈ | |
| ↑ | A.11 | essays | → ≈ | |
| | A.2 | Pediatric ophthalmology | |
| | A.2 | Encyclopaedias and encyclopedic dictionaries | |
| | A.3 | biographies | |
| | A.4 | Dictionaries, vocabulary | |
| | A.5 | conference proceedings | |
| | A.6 | exhibitions catalogues | |
| ↑ | A.7a | studies in onor of | → ≈ | |
| ↑ | A.7b | scripta minora | → ≈ | |
| | A.8 | chronology | |
| ↑ | A.9 | | → ≈ | |
| ↑ | A.AR.CL.1 | Bibliographic introductions, bibliographies, library catalogues | → ≈ | |
| ↑ | A.AR.CL.10 | Excavations, topography, cartography, archaeological sites | → ≈ | |
| ↑ | A.AR.CL.11 | manuals | → ≈ | |
| ↑ | A.AR.CL.12 | history of archaeology | → ≈ | |
| ↑ | A.AR.CL.13 | auxiliary sciences | → ≈ | |
| ↑ | A.AR.CL.14 | Tests of a general or transverse nature | → ≈ | |
| ↑ | A.AR.CL.15 | Architecture (in general) | → ≈ | |
| ↑ | A.AR.CL.16 | sculpture (in general) | → ≈ | |
| ↑ | A.AR.CL.17 | Painting (in general) | → ≈ | |
| ↑ | A.AR.CL.18 | arts minor (in general) | → ≈ | |
| ↑ | A.AR.CL.2 | Encyclopaedias and encyclopedic dictionaries | → ≈ | |
| ↑ | A.AR.CL.3 | biographies | → ≈ | |
| ↑ | A.AR.CL.4 | dictionary, vocabulary | → ≈ | |
| ↑ | A.AR.CL.5 | conference proceedings: | → ≈ | |
| ↑ | A.AR.CL.6 | exhibitions catalogues | → ≈ | |
| ↑ | A.AR.CL.7 | Catalogues and guides of collections, museums | → ≈ | |
| ↑ | A.AR.CL.7a | sculpture | → ≈ | |
| ↑ | A.AR.CL.7b | painting | → ≈ | |
| ↑ | A.AR.CL.7c | Arts minor | → ≈ | |
| ↑ | A.AR.CL.8 | iconography | → ≈ | |
| ↑ | A.AR.CL.9 | Sources (collections or corpora of materials) | → ≈ | |
| ↑ | A.AR.CL.9a | written sources | → ≈ | |
| ↑ | A.Epigr.1 | Bibliographic introductions, bibliographies, library catalogues | → ≈ | |
| ↑ | A.Epigr.10 | manuals | → ≈ | |
| ↑ | A.Epigr.11 | essays | → ≈ | |
| ↑ | A.Epigr.2 | Encyclopaedias and encyclopedic dictionaries | → ≈ | |
| ↑ | A.Epigr.3 | biographies | → ≈ | |
| ↑ | A.Epigr.4 | dictionary, vocabulary | → ≈ | |
| ↑ | A.Epigr.5 | conference proceedings | → ≈ | |
| ↑ | A.Epigr.6 | exhibition catalogues | → ≈ | |
| ↑ | A.Epigr.7 | Catalogues and guides of lapidaries | → ≈ | |
| ↑ | A.Epigr.8 | Corpora and epigraphic syllogists | → ≈ | |
| ↑ | A.Epigr.8a | greek | → ≈ | |
| ↑ | A.Epigr.8b | Etruscan and Italic | → ≈ | |
| ↑ | A.Epigr.8c | latin | → ≈ | |
| ↑ | A.Epigr.8d | christians | → ≈ | |
| ↑ | A.Epigr.9 | Studies of epigraphy (in general) | → ≈ | |
| ↑ | A.Epigr.9a | Greece | → ≈ | |
| ↑ | A.Epigr.9b | Balkans and Eastern Europe | → ≈ | |
| ↑ | A.Epigr.9c | Etruria and pre-Roman Italy | → ≈ | |
| ↑ | A.Epigr.9d | roman italy | → ≈ | |
| ↑ | A.Epigr.9e | central and western Europe | → ≈ | |
| ↑ | A.Epigr.9f | Africa | → ≈ | |
| ↑ | A.Epigr.9g | Asia minor | → ≈ | |
| ↑ | A.Epigr.9h | Christian epigraphy | → ≈ | |
| ↑ | A.ETR.1 | Bibliographic introductions, bibliographies, library catalogues | → ≈ | |
| ↑ | A.ETR.10 | manuals | → ≈ | |
| ↑ | A.ETR.11 | Etruscan language [hermeneutics and translation/commentary essays | → ≈ | |
| ↑ | A.ETR.12 | Essays in general | → ≈ | |
| ↑ | A.ETR.12a | Essays of Architecture | → ≈ | |
| ↑ | A.ETR.12b | Essays on sculpture | → ≈ | |
| ↑ | A.ETR.12c | Essays on painting | → ≈ | |
| ↑ | A.ETR.12d | Essays on other arts (urns, sarcophagi, votive statues, etc.) | → ≈ | |
| ↑ | A.ETR.13 | Pre-roman Italy | → ≈ | |
| ↑ | A.ETR.2 | Encyclopaedias and encyclopedic dictionaries | → ≈ | |
| ↑ | A.ETR.3 | biographies | → ≈ | |
| ↑ | A.ETR.4 | dictionary, vocabulary | → ≈ | |
| ↑ | A.ETR.5 | conference proceedings | → ≈ | |
| ↑ | A.ETR.6 | exhibition catalogues | → ≈ | |
| ↑ | A.ETR.7 | Catalogues and guides of collections, museums | → ≈ | |
| ↑ | A.ETR.8 | Excavations, topography, archaeological sites | → ≈ | |
| ↑ | A.ETR.9 | literary sources | → ≈ | |
| ↑ | A.ETR.9a | Non-literary sources in collections or corpora | → ≈ | |
| ↑ | A.Or.1 | Bibliographic introductions, bibliographies, library catalogues | → ≈ | |
| ↑ | A.Or.10 | General or transverse essays | → ≈ | |
| ↑ | A.Or.11 | Assirology - Monographs | → ≈ | |
| ↑ | A.Or.12 | assirology - monographs in series | → ≈ | |
| ↑ | A.Or.13 | History of the Ancient Near East | → ≈ | |
| ↑ | A.Or.13a | History of Mesopotamian Religions, Mesopotamian Mythology | → ≈ | |
| ↑ | A.Or.14 | Anatolian civilization (in general - Hittites, Persians) | → ≈ | |
| ↑ | A.Or.14a | Historical-cultural studies , religion | → ≈ | |
| ↑ | A.Or.14b | Linguistic and Grammatical Studies, Texts | → ≈ | |
| ↑ | A.Or.14c | Anatolian hieroglyphic | → ≈ | |
| ↑ | A.Or.14d | Iron Age: First millennium a. C | → ≈ | |
| ↑ | A.Or.15 | Anatolian civilization | → ≈ | |
| ↑ | A.Or.16 | Civilization of Syria and the Levant | → ≈ | |
| ↑ | A.Or.17 | Civilization of Syria and the Levant | → ≈ | |
| ↑ | A.Or.18 | Archaeology of the Near East (in general) | → ≈ | |
| ↑ | A.Or.18a | Archaeology of Mesopotamia, Syria | → ≈ | |
| ↑ | A.Or.18b | Glittic (also includes seals) | → ≈ | |
| ↑ | A.Or.18c | Anatolian archaeology | → ≈ | |
| ↑ | A.Or.2 | Encyclopedias and encyclopedic dictionaries , Historical Atlases | → ≈ | |
| ↑ | A.Or.3 | biographies | → ≈ | |
| ↑ | A.Or.4 | dictionary, vocabulary | → ≈ | |
| ↑ | A.Or.5 | conference proceedings | → ≈ | |
| ↑ | A.Or.6 | exhibition catalogues | → ≈ | |
| ↑ | A.Or.7 | Catalogues and guides of collections, museums | → ≈ | |
| ↑ | A.Or.8 | Editions of excavations, topography | → ≈ | |
| ↑ | A.Or.9 | manuals | → ≈ | |
| ↑ | A.Or.9a | Didactic manuals (textbooks) | → ≈ | |
| ↑ | A.Or.9b | various manuals | → ≈ | |
| ↑ | A.Or.9c | grammars | → ≈ | |
| ↑ | A.Pr.1 | Bibliographic introductions, bibliographies, library catalogues | → ≈ | |
| ↑ | A.Pr.10 | prehistory and protohistory | → ≈ | |
| ↑ | A.Pr.2 | Encyclopedias and encyclopedic dictionaries | → ≈ | |
| ↑ | A.Pr.3 | biographies | → ≈ | |
| ↑ | A.Pr.4 | dictionary, vocabulary | → ≈ | |
| ↑ | A.Pr.5 | conference proceedings | → ≈ | |
| ↑ | A.Pr.6 | exhibition catalogues | → ≈ | |
| ↑ | A.Pr.7 | catalogues and guides of collections,museums | → ≈ | |
| ↑ | A.Pr.8 | manuals | → ≈ | |
| ↑ | A.Pr.9 | Essays of a general nature | → ≈ | |
| ↑ | A.Pr.9a | Prehistory and protohistory: other civilizations (not italic) | → ≈ | |
| ↑ | A.Pr.9b | Italian prehistory and protohistory. | → ≈ | |
| ↑ | A.SEM.1 | Bibliographic introductions, bibliographies | → ≈ | |
| ↑ | A.SEM.10 | manuals | → ≈ | |
| ↑ | A.SEM.10a | Grammars , books on a writing history | → ≈ | |
| ↑ | A.SEM.11 | History of Modern Judaism | → ≈ | |
| ↑ | A.SEM.11a | texts | → ≈ | |
| ↑ | A.SEM.11b | biblical exegesis , history of exegesis , biblical philology | → ≈ | |
| ↑ | A.SEM.12 | Qumran : texts and studies , Essenes | → ≈ | |
| ↑ | A.SEM.12a | Qumran : series, Sources | → ≈ | |
| ↑ | A.SEM.13 | Aramaic and Syriac: texts and studies (also place here Mandaico, Kanaaische..) | → ≈ | |
| ↑ | A.SEM.14 | Arabic and Islamic literature: texts and studies | → ≈ | |
| ↑ | A.SEM.15 | Ethiopian and related: texts and studies (includes: Amharic, Tigrinya, ge'ez..) | → ≈ | |
| ↑ | A.SEM.16 | Judaeo-Arabic literature and medieval Judaism | → ≈ | |
| ↑ | A.SEM.17 | Coptic Gnostic literature: texts and studies | → ≈ | |
| ↑ | A.SEM.18 | Storia dell'ebraismo antico: storia/geografia di Israele e della Palestina, | → ≈ | |
| ↑ | A.SEM.2 | Encyclopaedias and encyclopedic dictionaries | → ≈ | |
| ↑ | A.SEM.3 | biographies | → ≈ | |
| ↑ | A.SEM.4 | dictionary,vocabulary | → ≈ | |
| ↑ | A.SEM.5 | conference proceedings | → ≈ | |
| ↑ | A.SEM.6 | exhibition catalogues | → ≈ | |
| ↑ | A.SEM.7 | Catalogues and guides of collections, museums | → ≈ | |
| ↑ | A.SEM.8 | archeology | → ≈ | |
| ↑ | A.SEM.9 | sources | → ≈ | |
| ↑ | A.SEM.9a | series | → ≈ | |
| ↑ | A.St.A.1 | Bibliographic introductions, bibliographies, library catalogues | → ≈ | |
| ↑ | A.St.A.10 | volumes in collections | → ≈ | |
| ↑ | A.St.A.11 | History of historiography (in general) | → ≈ | |
| ↑ | A.St.A.11a | ancient historians, ethnographers and geographers | → ≈ | |
| ↑ | A.St.A.11b | modern historians | → ≈ | |
| ↑ | A.St.A.12 | manuals (in general) | → ≈ | |
| ↑ | A.St.A.13 | Essays (in general) | → ≈ | |
| ↑ | A.St.A.13a | Greek antiquities | → ≈ | |
| ↑ | A.St.A.13b | Roman antiquities | → ≈ | |
| ↑ | A.St.A.13c | agriculture , agronomy | → ≈ | |
| ↑ | A.St.A.13d | economic and social institutions | → ≈ | |
| ↑ | A.St.A.13e | demography (history of population, migratory movements, etc.) | → ≈ | |
| ↑ | A.St.A.13f | political and legal institutions | → ≈ | |
| ↑ | A.St.A.13g | geography, topography of the ancient world | → ≈ | |
| ↑ | A.St.A.13h | militaria, navalia | → ≈ | |
| ↑ | A.St.A.13i | science (in general) | → ≈ | |
| ↑ | A.St.A.13l | astronomy and mathematics | → ≈ | |
| ↑ | A.St.A.13m | natural sciences , botany | → ≈ | |
| ↑ | A.St.A.13n | medicine | → ≈ | |
| ↑ | A.St.A.13o | technologies | → ≈ | |
| ↑ | A.St.A.13p | building and urban planning | → ≈ | |
| ↑ | A.St.A.14 | Oriental history (Persia and Egypt from the VII to the IV sec. a.c.) | → ≈ | |
| ↑ | A.St.A.15 | Greek history (in general) | → ≈ | |
| ↑ | A.St.A.15a | Ancient Greece (Aegean civilization: Minoans and Mycenaeans | → ≈ | |
| ↑ | A.St.A.15b | classical Greek | → ≈ | |
| ↑ | A.St.A.15c | hellenistic word | → ≈ | |
| ↑ | A.St.A.16 | Roman history (in general) | → ≈ | |
| ↑ | A.St.A.16a | history of Rome regia | → ≈ | |
| ↑ | A.St.A.16b | history of high- and middle-republican Rome | → ≈ | |
| ↑ | A.St.A.16c | history of late Republican Rome | → ≈ | |
| ↑ | A.St.A.16d | history of imperial Rome | → ≈ | |
| ↑ | A.St.A.16e | history of the provinces of the Roman Empire | → ≈ | |
| ↑ | A.St.A.17 | Byzantine history, | → ≈ | |
| ↑ | A.St.A.18 | History of Ancient Religions (in general) | → ≈ | |
| ↑ | A.St.A.18a | primal | → ≈ | |
| ↑ | A.St.A.18b | oriental (in classical age) | → ≈ | |
| ↑ | A.St.A.18c | greek | → ≈ | |
| ↑ | A.St.A.18d | etruscan and italic | → ≈ | |
| ↑ | A.St.A.18e | roman | → ≈ | |
| ↑ | A.St.A.18f | primitive Christian (in the Roman imperial period) | → ≈ | |
| ↑ | A.St.A.18g | Judeo-Hellenistic | → ≈ | |
| ↑ | A.St.A.19 | papyrology | → ≈ | |
| ↑ | A.St.A.2 | Encyclopaedias and encyclopedic dictionaries | → ≈ | |
| ↑ | A.St.A.20 | History, society and culture of barbarian peoples, history of invasions | → ≈ | |
| ↑ | A.St.A.3 | biographies | → ≈ | |
| ↑ | A.St.A.4 | Dictionaries, lexicons | → ≈ | |
| ↑ | A.St.A.5 | Acts of congresses | → ≈ | |
| ↑ | A.St.A.6 | exhibition catalogues | → ≈ | |
| ↑ | A.St.A.7 | cronolgies | → ≈ | |
| ↑ | A.St.A.8 | Historical atlases and aerial photographs | → ≈ | |
| ↑ | A.St.A.9 | Sources not in necklace | → ≈ | |
| ↑ | A.St.A.9a | Sources in necklace | → ≈ | |
| ↑ | A11 | AGARD | ≈ 624.17 | |
| | AC | congressional acts (elect.) | |
| ↑ | ACF | aqueducts and sewers | ≈ 628 | |
| ↑ | ACU | acoustics | ≈ 620.2 | |
| | AD | application of computers to teaching | |
| | AF | reliability | |
| ↑ | AF1 | reliability | ≈ 363.1 620.11 | |
| ↑ | AF2 | reliability of the equipment and electronic systems | ≈ 620.11 621.38 | |
| ↑ | AF3 | reliability of electrical systems | ≈ 620.11 621317 | |
| ↑ | AF4 | reliability and quality control | ≈ 620.11 658.4 | |
| ↑ | AF5 | burn-in | ≈ 620.11 | |
| ↑ | AF6 | reliability tests | ≈ 620.11 | |
| ↑ | AF7 | congresses (electr. reliability) | ≈ 620.11 621.31 | |
| | AI | artificial intelligence | |
| ↑ | AI1 | artificially intelligent | ≈ 006.3 | |
| ↑ | AI2 | artificial intelligence | ≈ 006.3 | |
| ↑ | AI3 | artificial intelligence 3 | ≈ 006.3 | |
| ↑ | AI4 | artificial intelligence 4 | ≈ 006.3 | |
| ↑ | AI5 | artificial intelligence 5 | ≈ 006.3 | |
| ↑ | AI6 | artificial intelligence 6 | ≈ 006.3 | |
| ↑ | AI7 | artificial intelligence 7, robotic | ≈ 006.3 629.8 | |
| ↑ | AI8 | artificial intelligence 8 | ≈ 006.3 | |
| ↑ | AI9 | Artificial intelligence 9, image processing | ≈ 006.3 152 | |
| ↑ | AII | theory of architecture | ≈ 720.1 | |
| ↑ | AIII | architectural composition | ≈ 720 729 | |
| ↑ | AIV | energetic | ≈ 333.7 720.47 | |
| | AL | algebra | |
| ↑ | AL1 | algebra 1 | ≈ 512 | |
| | AM | | |
| ↑ | AM1 | agricolture | ≈ 333.7 630 | |
| ↑ | AM2 | enviromnet | ≈ 333.72 720.47 | |
| ↑ | AM3 | quarries | ≈ 344 622.2 | |
| ↑ | AM4 | landfills | ≈ 628.4 | |
| ↑ | AM5 | parks and nature reserve | ≈ 719 | |
| ↑ | AM6 | green design | ≈ 712 | |
| ↑ | AM7 | nature conservation | ≈ 344 | |
| ↑ | AM8 | congresses (environment) | ≈ 363.7 | |
| ↑ | AMB | environments, energy | ≈ 333.7 | |
| | AN | algorithms and numerical methods | |
| ↑ | AN1 | optimization algorithms | ≈ 519 | |
| ↑ | AN2 | numerical analysis | ≈ 519.4 | |
| ↑ | AN3 | approximation methods | ≈ 519.4 | |
| ↑ | AN4 | numerical methods for partial derivative equations | ≈ 519.4 | |
| ↑ | AN5 | numerical methods for ordinary differential equations | ≈ 519.4 | |
| ↑ | AN6 | congresses (numerical analysis) | ≈ 519.4 | |
| ↑ | ANTICO.P | old materials | | |
| | AP | aerial and propagation | |
| ↑ | AP1 | electrical accumulators | ≈ 621.3824 | |
| ↑ | AP2 | electrical devices of manoeuvring and protection | ≈ 621317 | |
| ↑ | AP3 | sensors and electric actuators | ≈ 621.3824 | |
| ↑ | AP4 | congresses (electrical devices) | ≈ 621.31 | |
| ↑ | APE | [energy applications (hydraulic)] | | |
| ↑ | AR1 | architecture | ≈ 720 | |
| ↑ | AR10 | prefabricated buildings | | |
| ↑ | AR11 | residential construction | ≈ 728 | |
| ↑ | AR12 | school and university buildings | ≈ 727 | |
| ↑ | AR13 | sports and tourist buildings | ≈ 725.8 | |
| ↑ | AR14 | parks and garden | ≈ 712 | |
| ↑ | AR15 | lighting | ≈ 729.28 | |
| ↑ | AR16 | fires | ≈ 628.9 | |
| ↑ | AR17 | industrialization | ≈ 658.4 690.2 | |
| ↑ | AR18 | construction management and planning | ≈ 658.4 690.2 | |
| ↑ | AR19 | [design methodology] | | |
| ↑ | AR2 | | ≈ 720.47 | |
| ↑ | AR20 | technical legislation | ≈ 344 | |
| ↑ | AR21 | Pavia: architecture and urban planning | ≈ 720.94529 | |
| ↑ | AR22 | [construction production] | | |
| ↑ | AR23 | [building design] | | |
| ↑ | AR24 | security of the building system | ≈ 690.22 | |
| ↑ | AR25 | history of architecture and urban planning | ≈ 722 724 | |
| ↑ | AR26 | architecture of the twentieth century | ≈ 724.6 | |
| ↑ | AR27 | architects | ≈ 720.92 | |
| ↑ | AR28 | congresses (architecture) | ≈ 720 | |
| ↑ | AR29 | special buildings | ≈ 725 726 | |
| ↑ | AR3 | Technical Architecture. | ≈ 690 721 | |
| ↑ | AR4 | architectural barriers. | ≈ 720.42 | |
| ↑ | AR5 | Architectonic Composition | ≈ 729.1 | |
| ↑ | AR6 | hospital buildings | ≈ 725.5 | |
| ↑ | AR7 | building | ≈ 690 | |
| ↑ | AR8 | industrial building | ≈ 725.4 | |
| ↑ | AR9 | social housing | ≈ 728.3 | |
| ↑ | AU1 | industrial automation | ≈ 658.5 | |
| ↑ | AU2 | industrial electronics and drives | ≈ 629 | |
| ↑ | AU3 | industrial robotics
| ≈ 629 | |
| ↑ | AU4 | Instrumentation for the automation | ≈ 658.5 | |
| ↑ | AU5 | congresses (Inudstrial automation) | ≈ 629 | |
| | AV | various applications (electr.) | |
| ↑ | AVI | history of architecture | ≈ 724 | |
| | A_ | aereonautics | |
