Classification
350 - Public administration & military science
320 - Political science
81
330 - Economics
35
300 - Social sciences
28
333 - Economics of land & energy
20
900 - History & geography
15
301 - Sociology & anthropology
12
340 - Law
11
600 - Technology
11
700 - The arts; fine & decorative arts
10
304 - Factors affecting social behavior
9
610 - Medicine & health
9
140 - Specific philosophical schools
8
363 - Other social problems & services
8
370 - Education
8
000 - Computer science, information & general works
6
380 - Commerce, communications & transportation
6
551 - Geology, hydrology & meteorology
6
100 - Philosophy & psychology
5
361 - Social problems & social welfare in general
5
630 - Agriculture & related technologies
4
120 - Epistemology, causation & humankind
3
170 - Ethics
3
581 - Specific topics in natural history
3
620 - Engineering & allied operations
3
657 - Accounting
3
400 - Language
2
576 - Genetics & evolution
2
658 - General management
2
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
360 - Social problems & services; associations
1
500 - Natural sciences & mathematics
1
530 - Physics
1
612 - Human physiology
1
650 - Management & auxiliary services
1
720 - Architecture
1