Classification
320 - Political science
160
330 - Economics
117
340 - Law
74
333 - Economics of land & energy
65
300 - Social sciences
56
700 - The arts; fine & decorative arts
53
900 - History & geography
52
600 - Technology
49
363 - Other social problems & services
44
000 - Computer science, information & general works
43
380 - Commerce, communications & transportation
39
304 - Factors affecting social behavior
35
610 - Medicine & health
26
140 - Specific philosophical schools
25
620 - Engineering & allied operations
25
630 - Agriculture & related technologies
22
370 - Education
20
551 - Geology, hydrology & meteorology
16
400 - Language
14
100 - Philosophy & psychology
11
410 - Linguistics
10
580 - Plants (Botany)
10
581 - Specific topics in natural history
8
361 - Social problems & social welfare in general
7
170 - Ethics
6
658 - General management
6
350 - Public administration & military science
5
720 - Architecture
5
800 - Literature & rhetoric
5
200 - Religion
4
301 - Sociology & anthropology
4
540 - Chemistry & allied sciences
4
576 - Genetics & evolution
4
530 - Physics
3
336 - Public finance
2
500 - Natural sciences & mathematics
2
657 - Accounting
2
780 - Music
2
297 - Islam, Babism & Bahai Faith
1
364 - Criminology
1
414 - Phonology & phonetics
1
615 - Pharmacology & therapeutics
1
791 - Public performances
1