Classification
330 - Economics
340 - Law
581 - Specific topics in natural history
363 - Other social problems & services
7
333 - Economics of land & energy
6
320 - Political science
4
630 - Agriculture & related technologies
4
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
600 - Technology
2
610 - Medicine & health
2
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
350 - Public administration & military science
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
590 - Animals (Zoology)
1
612 - Human physiology
1