Classification
320 - Political science
330 - Economics
42,235
340 - Law
5,062
900 - History & geography
4,453
300 - Social sciences
3,685
630 - Agriculture & related technologies
1,587
700 - The arts; fine & decorative arts
1,586
333 - Economics of land & energy
1,441
370 - Education
810
200 - Religion
589
363 - Other social problems & services
585
610 - Medicine & health
559
600 - Technology
499
576 - Genetics & evolution
428
100 - Philosophy & psychology
396
140 - Specific philosophical schools
388
304 - Factors affecting social behavior
342
380 - Commerce, communications & transportation
324
170 - Ethics
322
800 - Literature & rhetoric
294
000 - Computer science, information & general works
248
551 - Geology, hydrology & meteorology
183
301 - Sociology & anthropology
164
620 - Engineering & allied operations
129
400 - Language
120
500 - Natural sciences & mathematics
116
720 - Architecture
114
361 - Social problems & social welfare in general
87
160 - Logic
83
581 - Specific topics in natural history
82
350 - Public administration & military science
79
297 - Islam, Babism & Bahai Faith
72
336 - Public finance
72
780 - Music
63
658 - General management
45
410 - Linguistics
36
580 - Plants (Botany)
35
360 - Social problems & services; associations
32
791 - Public performances
30
530 - Physics
29
323 - Civil & political rights
22
364 - Criminology
22
120 - Epistemology, causation & humankind
17
550 - Earth sciences
15
657 - Accounting
15
770 - Photography, photographs & computer art
13
920 - Biography, genealogy & insignia
13
296 - Judaism
12
540 - Chemistry & allied sciences
12
414 - Phonology & phonetics
11
more ...