Classification
333 - Economics of land & energy
330 - Economics
2,083
320 - Political science
1,989
600 - Technology
1,661
363 - Other social problems & services
1,443
700 - The arts; fine & decorative arts
1,434
610 - Medicine & health
1,110
620 - Engineering & allied operations
1,095
000 - Computer science, information & general works
1,009
900 - History & geography
946
380 - Commerce, communications & transportation
738
370 - Education
512
304 - Factors affecting social behavior
440
140 - Specific philosophical schools
438
580 - Plants (Botany)
404
530 - Physics
377
630 - Agriculture & related technologies
364
500 - Natural sciences & mathematics
303
551 - Geology, hydrology & meteorology
302
576 - Genetics & evolution
277
540 - Chemistry & allied sciences
257
100 - Philosophy & psychology
254
300 - Social sciences
241
338 - Production
202
340 - Law
197
581 - Specific topics in natural history
193
720 - Architecture
157
658 - General management
128
400 - Language
110
414 - Phonology & phonetics
109
621 - Applied physics
108
800 - Literature & rhetoric
106
336 - Public finance
94
170 - Ethics
77
612 - Human physiology
65
301 - Sociology & anthropology
56
200 - Religion
55
361 - Social problems & social welfare in general
53
410 - Linguistics
48
615 - Pharmacology & therapeutics
35
780 - Music
26
657 - Accounting
24
350 - Public administration & military science
22
297 - Islam, Babism & Bahai Faith
20
520 - Astronomy & allied sciences
16
120 - Epistemology, causation & humankind
15
770 - Photography, photographs & computer art
13
650 - Management & auxiliary services
11
332 - Financial economics
10
550 - Earth sciences
10
more ...