Classification
320 - Political science
330 - Economics
166
900 - History & geography
18
300 - Social sciences
17
340 - Law
13
610 - Medicine & health
11
333 - Economics of land & energy
6
630 - Agriculture & related technologies
6
700 - The arts; fine & decorative arts
6
100 - Philosophy & psychology
4
200 - Religion
4
600 - Technology
4
576 - Genetics & evolution
3
800 - Literature & rhetoric
3
140 - Specific philosophical schools
2
160 - Logic
2
297 - Islam, Babism & Bahai Faith
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
323 - Civil & political rights
2
361 - Social problems & social welfare in general
2
370 - Education
2
380 - Commerce, communications & transportation
2
581 - Specific topics in natural history
2
658 - General management
2
170 - Ethics
1
360 - Social problems & services; associations
1
363 - Other social problems & services
1
364 - Criminology
1
400 - Language
1
500 - Natural sciences & mathematics
1