Classification
320 - Political science
330 - Economics
6,882
300 - Social sciences
5,957
900 - History & geography
1,159
630 - Agriculture & related technologies
873
340 - Law
467
576 - Genetics & evolution
466
333 - Economics of land & energy
367
363 - Other social problems & services
197
700 - The arts; fine & decorative arts
187
100 - Philosophy & psychology
155
600 - Technology
123
610 - Medicine & health
123
000 - Computer science, information & general works
104
380 - Commerce, communications & transportation
99
370 - Education
91
304 - Factors affecting social behavior
87
140 - Specific philosophical schools
69
361 - Social problems & social welfare in general
66
551 - Geology, hydrology & meteorology
57
170 - Ethics
50
620 - Engineering & allied operations
47
336 - Public finance
43
301 - Sociology & anthropology
38
350 - Public administration & military science
32
581 - Specific topics in natural history
32
200 - Religion
30
800 - Literature & rhetoric
30
658 - General management
23
500 - Natural sciences & mathematics
22
400 - Language
14
657 - Accounting
14
720 - Architecture
11
360 - Social problems & services; associations
10
580 - Plants (Botany)
10
780 - Music
10
160 - Logic
9
297 - Islam, Babism & Bahai Faith
7
410 - Linguistics
6
530 - Physics
6
943 - Central Europe; Germany
6
364 - Criminology
5
540 - Chemistry & allied sciences
4
550 - Earth sciences
4
327 - International relations
3
414 - Phonology & phonetics
3
770 - Photography, photographs & computer art
3
338 - Production
2
382 - International commerce
2
791 - Public performances
2
more ...