Classification
320 - Political science
330 - Economics
42,326
340 - Law
5,093
900 - History & geography
4,550
300 - Social sciences
3,857
700 - The arts; fine & decorative arts
1,658
630 - Agriculture & related technologies
1,602
333 - Economics of land & energy
1,519
370 - Education
838
200 - Religion
646
363 - Other social problems & services
637
610 - Medicine & health
595
600 - Technology
536
100 - Philosophy & psychology
464
576 - Genetics & evolution
435
140 - Specific philosophical schools
393
304 - Factors affecting social behavior
371
380 - Commerce, communications & transportation
356
170 - Ethics
337
800 - Literature & rhetoric
317
000 - Computer science, information & general works
306
301 - Sociology & anthropology
202
551 - Geology, hydrology & meteorology
194
620 - Engineering & allied operations
147
400 - Language
139
500 - Natural sciences & mathematics
122
720 - Architecture
121
361 - Social problems & social welfare in general
99
581 - Specific topics in natural history
88
160 - Logic
83
297 - Islam, Babism & Bahai Faith
81
350 - Public administration & military science
81
336 - Public finance
74
780 - Music
71
410 - Linguistics
52
658 - General management
47
580 - Plants (Botany)
38
360 - Social problems & services; associations
37
530 - Physics
30
323 - Civil & political rights
25
364 - Criminology
25
120 - Epistemology, causation & humankind
24
540 - Chemistry & allied sciences
16
657 - Accounting
16
550 - Earth sciences
15
770 - Photography, photographs & computer art
15
920 - Biography, genealogy & insignia
13
414 - Phonology & phonetics
12
296 - Judaism
11
791 - Public performances
11
more ...