Classification
320 - Political science
330 - Economics
61,604
900 - History & geography
8,477
340 - Law
8,297
300 - Social sciences
7,416
630 - Agriculture & related technologies
2,490
700 - The arts; fine & decorative arts
2,349
333 - Economics of land & energy
1,952
576 - Genetics & evolution
1,457
370 - Education
1,095
200 - Religion
1,015
100 - Philosophy & psychology
992
610 - Medicine & health
865
363 - Other social problems & services
835
600 - Technology
683
304 - Factors affecting social behavior
582
140 - Specific philosophical schools
509
170 - Ethics
502
380 - Commerce, communications & transportation
471
800 - Literature & rhetoric
437
000 - Computer science, information & general works
344
301 - Sociology & anthropology
292
400 - Language
231
551 - Geology, hydrology & meteorology
219
500 - Natural sciences & mathematics
216
361 - Social problems & social welfare in general
184
720 - Architecture
164
620 - Engineering & allied operations
159
336 - Public finance
131
297 - Islam, Babism & Bahai Faith
130
350 - Public administration & military science
125
160 - Logic
123
780 - Music
112
581 - Specific topics in natural history
109
410 - Linguistics
82
658 - General management
74
360 - Social problems & services; associations
57
530 - Physics
52
943 - Central Europe; Germany
48
364 - Criminology
43
580 - Plants (Botany)
40
120 - Epistemology, causation & humankind
37
650 - Management & auxiliary services
34
323 - Civil & political rights
24
657 - Accounting
22
414 - Phonology & phonetics
20
550 - Earth sciences
20
920 - Biography, genealogy & insignia
20
296 - Judaism
19
940 - History of Europe
19
more ...