Classification
100 - Philosophy & psychology
330 - Economics
320 - Political science
156
300 - Social sciences
64
900 - History & geography
58
333 - Economics of land & energy
47
170 - Ethics
46
700 - The arts; fine & decorative arts
39
610 - Medicine & health
37
140 - Specific philosophical schools
31
600 - Technology
31
363 - Other social problems & services
30
340 - Law
28
200 - Religion
26
000 - Computer science, information & general works
24
370 - Education
24
620 - Engineering & allied operations
17
380 - Commerce, communications & transportation
15
301 - Sociology & anthropology
14
500 - Natural sciences & mathematics
13
658 - General management
12
780 - Music
12
800 - Literature & rhetoric
11
576 - Genetics & evolution
10
630 - Agriculture & related technologies
10
400 - Language
9
581 - Specific topics in natural history
9
551 - Geology, hydrology & meteorology
8
361 - Social problems & social welfare in general
7
410 - Linguistics
6
530 - Physics
5
304 - Factors affecting social behavior
4
580 - Plants (Botany)
4
720 - Architecture
4
350 - Public administration & military science
3
612 - Human physiology
3
657 - Accounting
3
770 - Photography, photographs & computer art
3
120 - Epistemology, causation & humankind
2
540 - Chemistry & allied sciences
2
297 - Islam, Babism & Bahai Faith
1
306 - Culture & institutions
1
336 - Public finance
1
550 - Earth sciences
1
791 - Public performances
1