Classification
100 - Philosophy & psychology
170 - Ethics
320 - Political science
330 - Economics
300 - Social sciences
11
140 - Specific philosophical schools
7
340 - Law
7
333 - Economics of land & energy
6
363 - Other social problems & services
5
700 - The arts; fine & decorative arts
4
900 - History & geography
4
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
361 - Social problems & social welfare in general
2
600 - Technology
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
658 - General management
1