Classification
330 - Economics
333 - Economics of land & energy
1,065
320 - Political science
992
700 - The arts; fine & decorative arts
765
363 - Other social problems & services
756
600 - Technology
703
900 - History & geography
643
000 - Computer science, information & general works
623
380 - Commerce, communications & transportation
450
620 - Engineering & allied operations
435
610 - Medicine & health
414
300 - Social sciences
383
140 - Specific philosophical schools
334
100 - Philosophy & psychology
303
340 - Law
277
551 - Geology, hydrology & meteorology
219
370 - Education
214
630 - Agriculture & related technologies
192
580 - Plants (Botany)
180
658 - General management
171
361 - Social problems & social welfare in general
136
500 - Natural sciences & mathematics
123
576 - Genetics & evolution
119
304 - Factors affecting social behavior
116
170 - Ethics
112
301 - Sociology & anthropology
107
581 - Specific topics in natural history
105
800 - Literature & rhetoric
88
720 - Architecture
84
540 - Chemistry & allied sciences
77
657 - Accounting
73
200 - Religion
65
400 - Language
65
350 - Public administration & military science
57
336 - Public finance
56
530 - Physics
41
780 - Music
39
410 - Linguistics
36
414 - Phonology & phonetics
28
297 - Islam, Babism & Bahai Faith
23
360 - Social problems & services; associations
23
770 - Photography, photographs & computer art
16
615 - Pharmacology & therapeutics
14
612 - Human physiology
13
791 - Public performances
11
364 - Criminology
10
650 - Management & auxiliary services
9
160 - Logic
6
520 - Astronomy & allied sciences
6
550 - Earth sciences
4
more ...