Classification
100 - Philosophy & psychology
320 - Political science
900 - History & geography
7
300 - Social sciences
6
333 - Economics of land & energy
6
370 - Education
5
140 - Specific philosophical schools
4
330 - Economics
4
340 - Law
4
301 - Sociology & anthropology
3
610 - Medicine & health
3
120 - Epistemology, causation & humankind
2
600 - Technology
2
800 - Literature & rhetoric
2
170 - Ethics
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
364 - Criminology
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1