| ↑ | D +n | engineering of land |   ≈ 711 |   |
| ↑ | D II | Monuments and historical centres | ≈ 711.4 | |
| | D.1 | Bibliographic introductions, bibliographies | |
| | D.1 | Physiology in ophthalmology | |
| | D.2 | biochemistry in ophthalmology | |
| ↑ | D.2a | General works, not encyclopedic | | |
| | D.3 | microbiology in ophthalmology | |
| | D.4 | immunology in ophthalmology | |
| | D.5 | genetics in ophthalmology | |
| ↑ | D.8a | Historical atlases, facsimiles, anastatic reprints | | |
| ↑ | D.8b | Scholastic and thematic atlases, methodical | | |
| ↑ | D.8c | International atlases | | |
| ↑ | D.8d | National and regional atlases | | |
| ↑ | D.@3 | biographies | | |
| ↑ | D.@4 | dictionaries, vocabularies | | |
| ↑ | D.@5 | conference proceedings | | |
| ↑ | D.@6 | exhibition catalogues | | |
| ↑ | D.@7 | Studies in honour, minor works, geographical writings | | |
| ↑ | D.@9 | Ancient atlases, ancient papers, ancient and rare books | | |
| ↑ | D.Cart.1 | General and manual cartography | | |
| ↑ | D.Cart.2 | History of cartography | | |
| ↑ | D.Cart.3 | Facsimiles of maps and atlases | | |
| ↑ | D.Cart.4a | Consolidated maps by internal criteria title by title | | |
| ↑ | D.Cart.4b | Maps sorted by scale: | | |
| ↑ | D.Cart.4c | Thematic maps | | |
| ↑ | D.Cart.4c.a | city plants Italian | | |
| ↑ | D.Cart.4c.b | historical plants | | |
| ↑ | D.Cart.4c.c | city plants ester | | |
| ↑ | D.Cart.4c.d | maps of the Mediterranean region | | |
| ↑ | D.Cart.4c.e | hydrographic and nautical charts, geological, mining | | |
| ↑ | D.Cart.4c.f | materials related to the work of professors | | |
| ↑ | D.Cart.4d | Geographical maps sorted by geographical area | | |
| ↑ | D.Geo.1 | History of geography including ancient history | | |
| ↑ | D.Geo.10 | guidebooks | | |
| ↑ | D.Geo.11 | guidebooks | | |
| ↑ | D.Geo.2 | Didactics of geography | | |
| ↑ | D.Geo.3 | Manuals and general essays | | |
| ↑ | D.Geo.4 | Essays in a necklace | | |
| ↑ | D.Geo.5a | Regional geography of a general nature | | |
| ↑ | D.Geo.5a.a | Italy in general | | |
| ↑ | D.Geo.5a.b | Europe including Turkey | | |
| ↑ | D.Geo.5a.c | Asia, Russia/USSR, Middle East | | |
| ↑ | D.Geo.5a.d | Africa | | |
| ↑ | D.Geo.5a.e | America, Atlantic islands | | |
| ↑ | D.Geo.5a.f | | | |
| ↑ | D.Geo.5a.g | Arctic and Antarctic | | |
| ↑ | D.Geo.5b | Geography of the environment | | |
| ↑ | D.Geo.5c | historical geography | | |
| ↑ | D.Geo.5d | Political geography, Social geography | | |
| ↑ | D.Geo.6 | Reports of travels and explorations, logbooks, etc. | | |
| ↑ | D.Geo.7 | History of exploration and navigation | | |
| ↑ | D.Geo.8 | guidebooks | | |
| ↑ | D.Geo.9 | guidebooks | | |
| | D1 | hydraulics | |
| ↑ | D1A | building science | ≈ 624.1 | |
| ↑ | D1B | construction technology | ≈ 624.15 | |
| ↑ | D1C | dynamics, stability, finite elements | ≈ 620.15 | |
| ↑ | D1D | Mathematics and mathematics manuals | ≈ 519.4 | |
| ↑ | D1E | mechanical technologies | ≈ 624.1 | |
| ↑ | D1Z | the other lesson texts (struct. mechanics) | ≈ 620 | |
| ↑ | D20 | Education and training of the engineer | ≈ 607 | |
| ↑ | D21 | Vocabularies (Mecc. str.) | ≈ 420 | |
| ↑ | D22 | indexed and yearbooks (struct. mechanics) | ≈ 624.1 | |
| ↑ | D2A | Manuals for the engineering | ≈ 602 | |
| ↑ | D2B | structures calculation manuals | ≈ 624.17 | |
| ↑ | D2C | reinforced and prestressed concrete calculation manuals | ≈ 624183 | |
| ↑ | D2D | steel constructions calculation manuals | ≈ 624182 | |
| ↑ | D3A | Design and calculation of structures by electronic computer | ≈ 519.4 | |
| ↑ | D3B | Software manuals and graphical applications | ≈ 005.3 | |
| ↑ | D3C | Manuals of electronic machines | ≈ 005.1 | |
| ↑ | D3D | Programming manuals | ≈ 005.1 | |
| ↑ | D3E | Manuals of mechanical technologies | ≈ 602 | |
| ↑ | D4A | buildings and structural details | ≈ 624.17 | |
| ↑ | D4B | reinforced and prestressed concrete constructions | ≈ 624183 | |
| ↑ | D4C | steel constructions | ≈ 624182 | |
| ↑ | D4D | mixed structures | ≈ 624.17 | |
| ↑ | D4E | Prefabricated buildings | ≈ 693.97 | |
| ↑ | D4F | constructions and elevated roads | ≈ 625 | |
| ↑ | D4G | geotechnics, methods of foundation engineering, tunnels | ≈ 624.15 | |
| ↑ | D4H | hydraulic constructions | ≈ 627 | |
| ↑ | D4I | constructions for storage, transport and lifting of materials | ≈ 629 | |
| ↑ | D4J | road, railways and airport constructions | ≈ 625 | |
| ↑ | D4K | analysis of collapses, restoration technique, restoration works, reinforcements | ≈ 624.17 | |
| ↑ | D4L | materials and materials technology | ≈ 620.1 | |
| ↑ | D4M | technology of bulding items and constructions | ≈ 624.17 | |
| ↑ | D4N | Production process technology, quality control | ≈ 658 | |
| ↑ | D4O | technical architecture | ≈ 690 | |
| ↑ | D4P | Constructions and structural details in masonry | ≈ 691 | |
| | D5 | Architecture and Urbanism | |
| ↑ | D6A | Construction management and planning | ≈ 692 | |
| ↑ | D6B | Industrialization | ≈ 690 | |
| | D7 | Construction machinery and organization | |
| | DB | databases | |
| | DE | electronic devices | |
| ↑ | DI1 | design | ≈ 720284 | |
| ↑ | DI2 | industrial design | ≈ 720284 | |
| ↑ | DI3 | technical design | ≈ 720284 | |
| ↑ | DI4 | systems of representation | ≈ 720284 | |
| ↑ | DI5 | Congresses (Design) | ≈ 720284 | |
| | DV | Dictionaries and vocabularies (Elettr.) | |
