Classification
300 - Social sciences
142
900 - History & geography
28
100 - Philosophy & psychology
18
305 - Social groups
16
301 - Sociology & anthropology
14
140 - Specific philosophical schools
12
320 - Political science
12
303 - Social processes
10
500 - Natural sciences & mathematics
7
304 - Factors affecting social behavior
6
330 - Economics
6
370 - Education
6
306 - Culture & institutions
5
700 - The arts; fine & decorative arts
5
331 - Labor economics
4
000 - Computer science, information & general works
3
121 - Epistemology
3
302 - Social interaction
3
658 - General management
3
980 - History of South America
3
016 - Bibliographies of works on specific subjects
2
070 - News media, journalism & publishing
2
155 - Differential & developmental psychology
2
158 - Applied psychology
2
338 - Production
2
339 - Macroeconomics & related topics
2
340 - Law
2
610 - Medicine & health
2
780 - Music
2
972 - Middle America; Mexico
2
120 - Epistemology, causation & humankind
1
200 - Religion
1
261 - Social theology
1
307 - Communities
1
308 - [Unassigned]
1
310 - Collections of general statistics
1
325 - International migration & colonization
1
333 - Economics of land & energy
1
335 - Socialism & related systems
1
363 - Other social problems & services
1
364 - Criminology
1
365 - Penal & related institutions
1
366 - Associations
1
380 - Commerce, communications & transportation
1
384 - Communications; telecommunication
1
577 - Ecology
1
600 - Technology
1
613 - Personal health & safety
1
670 - Manufacturing
1
796 - Athletic & outdoor sports & games
1
more ...