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973 - United States 20,951 972 - Mexico, Central America, West Indies 5,217 971 - Canada 3,414 970 - History of North America 2,876 974 - Northeastern United States 2,718 975 - Southeastern United States 2,574 979 - Great Basin & Pacific Slope region 2,522 978 - Western United States 2,266 976 - South central United States 2,212 977 - North central United States 2,022 305 - Groups of people 41 092 - Block books 40 913 - Geography of & travel in ancient world 36 917 - Geography of & travel in North America 31 306 - Culture and institutions 28 301 - Sociology and anthropology 25 920 - Biography, genealogy, insignia 22 324 - The political process 16 323 - Civil and political rights 15 327 - International relations 14 320 - Political science (Politics and government) 13 923 - (Optional number) 13 330 - Economics 10 081 - General collections in American English 9 303 - Social processes 9 364 - Criminology 9 338 - Production 8 779 - Photographic images 8 940 - History of Europe 8 299 - Religions not provided for elsewhere 7 328 - The legislative process 7 363 - Other social problems and services 6 791 - Public performances 6 304 - Factors affecting social behavior 5 309 - [Unassigned] 5 325 - International migration and colonization 5 331 - Labor economics 5 333 - Economics of land and energy 5 810 - American literature in English 5 813 - American fiction in English 5 929 - Genealogy, names & insignia 5 016 - Of works on specific subjects 4 307 - Communities 4 506 - Organizations and management 4 572 - Biochemistry 4 730 - Sculpture and related arts 4 732 - Sculpture to ca. 500 4 910 - Geography and travel 4 930 - History of ancient world to ca. 499 4 070 - Documentary, educational, news media; journalism 3 080 - General collections 3 335 - Socialism and related systems 3 352 - General considerations of public administration 3 355 - Military science 3 370 - Education 3 398 - Folklore 3 630 - Agriculture and related technologies 3 818 - American miscellaneous writings 3 921 - (Optional number) 3 943 - Germany & central Europe 3 980 - History of South America 3 001 - Knowledge 2 026 - Libraries and archives devoted to specific subjects 2 282 - Roman Catholic Church 2 300 - Social sciences 2 342 - Constitutional and administrative law 2 378 - Higher education (Tertiary education) 2 381 - Commerce (Trade) 2 387 - Water, air, space transportation 2 394 - General customs 2 508 - Natural history 2 700 - The arts 2 704 - Special topics in fine and decorative arts 2 709 - History, geographic treatment, biography 2 720 - Architecture 2 741 - Drawing and drawings 2 780 - Music 2 908 - Groups of people 2 909 - World history 2 945 - Italy, San Marino, Vatican City, Malta 2 013 - [Unassigned] 1 017 - Of works held in specific collections or offered for sale 1 019 - [Unassigned] 1 086 - Collections in Spanish, Portuguese, Galician 1 091 - Manuscripts 1 174 - Occupational ethics 1 211 - Concepts of God 1 261 - Social theology and interreligious relations 1 266 - Missions 1 270 - History, geographic treatment, biography 1 277 - History of Christianity in North America 1 283 - Anglican churches 1 285 - Presbyterian, Reformed & Congregational 1 289 - Other denominations and sects 1 291 - [Unassigned] 1 326 - Slavery and emancipation 1 343 - Military, tax, trade & industrial law 1 346 - Private law 1 353 - Specific fields of public administration 1 361 - Social problems and services 1