Classification
300 - Social sciences
20
900 - History & geography
320 - Political science
11
100 - Philosophy & psychology
7
200 - Religion
4
600 - Technology
4
333 - Economics of land & energy
3
576 - Genetics & evolution
3
620 - Engineering & allied operations
3
800 - Literature & rhetoric
3
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
340 - Law
2
363 - Other social problems & services
2
370 - Education
2
380 - Commerce, communications & transportation
2
410 - Linguistics
2
610 - Medicine & health
2
140 - Specific philosophical schools
1
170 - Ethics
1
296 - Judaism
1
330 - Economics
1
364 - Criminology
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1