| Library of Congress Classification |
| Class |
Subject |
| A |
General Works |
| B |
Philosophy Psychology Religion |
| B |
Philosophy |
| BC |
Logic |
| BF |
Psychology |
| BL |
Religions |
| BF |
Psychology |
| C |
Auxiliary Sciences of History |
| D |
History: General and Old World |
| D |
History |
| DA |
Great Britain |
| DC |
France |
| DS |
Asia |
| E-F |
America United States Local History |
| G |
Geography Anthropology |
| G |
Geography(General), Maps |
| GB |
Physical Geography |
| GC |
Oceanography |
| GF |
Human Ecology, Anthropogeography |
| GN |
Anthropology |
| GV |
Recreation, Leisure |
| H |
Social Sciences |
| HB |
Economic Theory Demography |
| HD |
Economic History and Conditions |
| HE |
Transportation and Communications |
| HF |
Commerce |
| HG |
Finance |
| HM |
Sociology |
| J |
Political Science |
| JC |
Political Theory |
| JX |
International Law Relations |
| K |
Law |
| L |
Education |
| M |
Music |
| N |
Fine Arts |
| NA |
Architeture |
| NC |
Drawing Design Illustration |
| ND |
Painting |
| NE |
Print Media |
| NK |
Decorative Arts Applied Arts |
| NX |
Arts in General |
| P |
Language and Literature |
| P |
Philology and Linguistics |
| PE |
English |
| PL |
Language and Literatures of Asia |
| PN |
Literary History and Collections |
| Q |
Science |
| Q |
Science(General) |
| QA |
Mathematics |
| QB |
Astronomy |
| QD |
Chemistry |
| QE |
Geology |
| QH |
Natural History Biology |
| R |
Medicine |
| S |
Agriculture |
| SB |
Plant Culture |
| SD |
Forestry |
| T |
Technology |
| T |
Technology(General) |
| TA |
Engineering Civil Engineering |
| TC |
Hydraulic Engineering |
| TD |
Environmental Technology |
| TE |
Highway Engineering Road |
| TG |
Bridge Engineering |
| TR |
Photography |
| TH |
Building Construction |
| TH |
Building Construction |
| TJ |
Mechanical Engineering |
| TK |
Electrical Engineering |
| TL |
Motor Vehicles, Aeronautics |
| TN |
Mining Engineering |
| TP |
Chemical Technology |
| U-V |
Military Science, Naval Science |
| Z |
Bibliography Library Science |
