| - K: Law
- KB-KBU: Religious Law
- KB: Religious Law (General and Miscellaneous)
- KBM: Jewish Law
- KBP: Islamic Law
- KBR: History of Canon Law
- KBU: Catholic Canon Law and The Holy See
- KD: Law in the United Kingdom and Ireland
- KE: Law in Canada
- KF-KFZ: Law in the United States
- KF: US Federal Law, and Common and Collective State Law
- KFA-KFW: Law in Individual US States
- KFX: Law in US Cities
- KFZ: Law in US territories and the Confederate States of America
- KG: Law in Latin America (General), and Law in Mexico, Central America, and the Caribbean Area
- KH-KHW: Law in South America
- KH: Law in South America (General)
- KHA: Law in Argentina
- KHC: Law in Bolivia
- KHD: Law in Brazil
- KHF: Law in Chile
- KHH: Law in Colombia
- KHK: Law in Ecuador
- KHL: Law in the Falkland Islands
- KHM: Law in French Guiana
- KHN: Law in Guyana
- KHP: Law in Paraguay
- KHQ: Law in Peru
- KHS: Law in Surinam
- KHU: Law in Uruguay
- KHW: Law in Venezuela
- KJ-KKZ: Law in Europe
- KJ: History of Law in Europe; Germanic Law
- KJA: Roman Law
- KJE: Law in the European Union and other European Regions and Groups
- KL-KWX: Law in Asia and Eurasia, Africa, Pacific Areas, and Antarctica
- KLA: Law in Pre-Soviet Russia and the Soviet Union
- KLB: Law in the Russian Federation (Since 1992)
- KMK: Law in Israel
- KMM: Law in Jordan
- KMP: Law in Lebanon
- KMU: Law in Syria
- KNG: Law in Bangladesh
- KNN: Law in China (General)
- KNQ: Law of the People's Republic of China
- KNS-KNU: Law in India
- KNW: Law in Indonesia
- KPA: Law in Korea (General) and South Korea
- KPC: Law in North Korea
- KPE: Law in Laos
- KPF: Law in Macao
- KPJ: Law in Mongolia
- KPK: Law in Nepal
- KPL: Law in Pakistan
- KPM: Law in the Philippines
- KPP: Law in Singapore
- KPS: Law in Sri Lanka
- KPT: Law in Thailand
- KPV-KPW: Law in Vietnam
- KQC: African Regional, Comparative, and Uniform Law
- KQV: Law in Burundi
- KQW: Law in Cameroon
- KSK: Law in Kenya
- KSN: Law in Liberia
- KSP: Law in Libya
- KTA: Law in Nigeria
- KTL: Law in South Africa
- KTT: Law in Tanzania
- KTV: Law in Tunisia
- KTW: Law in Uganda
- KWH: Law in Papua New Guinea
- KWW: Law in Samoa
- KWX: Law in Antarctica
- KZ: Law of Nations
- KZA: Law of the Sea
- L: Education
- LA: History of Education
- LB: Theory and Practice of Education
- LC: Social Aspects of Education
- LD-LG: Individual Educational Institutions
- LD: Individual Educational Institutions (United States)
- LE: Individual Educational Institutions (Americas outside the US)
- LF: Individual Educational Institutions (Europe)
- LG: Individual Educational Institutions (Asia, Africa, Oceania)
- LH: College and School Magazines and Papers
- LJ: Student Fraternities and Societies, United States
- LT: Textbooks
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