Classification
170 - Ethics
320 - Political science
14
330 - Economics
13
340 - Law
13
900 - History & geography
13
100 - Philosophy & psychology
10
140 - Specific philosophical schools
7
200 - Religion
7
700 - The arts; fine & decorative arts
6
600 - Technology
5
610 - Medicine & health
5
000 - Computer science, information & general works
4
800 - Literature & rhetoric
4
333 - Economics of land & energy
3
370 - Education
3
658 - General management
3
174 - Occupational ethics
2
297 - Islam, Babism & Bahai Faith
2
300 - Social sciences
2
301 - Sociology & anthropology
2
363 - Other social problems & services
2
158 - Applied psychology
1
304 - Factors affecting social behavior
1
306 - Culture & institutions
1
331 - Labor economics
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
400 - Language
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
650 - Management & auxiliary services
1