Classification
320 - Political science
330 - Economics
2,513
900 - History & geography
418
300 - Social sciences
226
576 - Genetics & evolution
186
340 - Law
139
700 - The arts; fine & decorative arts
64
800 - Literature & rhetoric
49
630 - Agriculture & related technologies
39
333 - Economics of land & energy
28
370 - Education
21
610 - Medicine & health
15
200 - Religion
12
304 - Factors affecting social behavior
10
140 - Specific philosophical schools
9
363 - Other social problems & services
9
100 - Philosophy & psychology
7
600 - Technology
7
301 - Sociology & anthropology
6
380 - Commerce, communications & transportation
6
170 - Ethics
5
297 - Islam, Babism & Bahai Faith
3
361 - Social problems & social welfare in general
3
400 - Language
3
000 - Computer science, information & general works
2
327 - International relations
2
338 - Production
2
550 - Earth sciences
2
551 - Geology, hydrology & meteorology
2
917 - Geography of & travel in North America
2
973 - United States
2
201 - Religious mythology & social theology
1
270 - History of Christianity & Christian church
1
296 - Judaism
1
324 - The political process
1
326 - Slavery & emancipation
1
331 - Labor economics
1
332 - Financial economics
1
336 - Public finance
1
342 - Constitutional & administrative law
1
343 - Military, tax, trade & industrial law
1
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
780 - Music
1