| J | General Legislative and Executive Papers |
| JA | Political Science (General) |
| JC | Political Theory, Theory of the State |
| JF | Political Institutions and Public Administration |
| JK | Political Institutions and Public Administration: United States |
| JL | Political Institutions and Public Administration: America Outside the U.S. |
| JN | Political Institutions and Public Administration: Europe |
| JQ | Political Institutions and Public Administration: Asia, Africa, Australia, Oceania |
| JS | Local Government |
| JV | Colonies and Colonization. Emigration and Immigration |
| JX | International Relations and Law |
| K |
Law (General) |
| KD |
United Kingdom and Ireland |
| KE |
Canada |
| KF |
United States |
| KG |
Central America, Caribbean |
| KH |
South America |
| KJ |
Europe |
| KM-KPZ |
Asia |
| L | Education |
| LA | History of Education |
| LB | Theory and Practice of Education |
| LC | Social Aspects of Education |
| LD | Individual Institutions: United States |
| LE | Individual Institutions: America except United States |
| LF | Individual Institutions: Europe |
| LG | Individual Institutions: Asia, Africa, Oceania |
| LH | College and School Magazines and Papers |
| LJ | Student Fraternities and Societies in the United States |
| LT | Multi-Subject Textbooks |
| M | Instrumental and Vocal Music |
| ML | Literature of Music |
| MT | Musical Instruction and Study |
| N | Visual Arts (General) |
| NA | Architecture |
| NB | Sculpture |
| NC | Illustration, Design, Drawing |
| ND | Painting |
| NE | Print Media |
| NK | Decorative Arts, Applied Arts |
| NX | Arts in General |