Classification
200 - Religion
320 - Political science
610 - Medicine & health
333 - Economics of land & energy
7
330 - Economics
6
900 - History & geography
5
100 - Philosophy & psychology
4
300 - Social sciences
4
363 - Other social problems & services
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
600 - Technology
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
170 - Ethics
2
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
340 - Law
2
370 - Education
2
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1