Classification
300 - Social sciences
16
900 - History & geography
320 - Political science
8
100 - Philosophy & psychology
6
200 - Religion
4
576 - Genetics & evolution
3
600 - Technology
3
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
333 - Economics of land & energy
2
340 - Law
2
380 - Commerce, communications & transportation
2
410 - Linguistics
2
620 - Engineering & allied operations
2
800 - Literature & rhetoric
2
170 - Ethics
1
296 - Judaism
1
330 - Economics
1
363 - Other social problems & services
1
370 - Education
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1