Classification
581 - Specific topics in natural history
610 - Medicine & health
18
333 - Economics of land & energy
5
612 - Human physiology
4
300 - Social sciences
3
900 - History & geography
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
301 - Sociology & anthropology
2
320 - Political science
2
340 - Law
2
700 - The arts; fine & decorative arts
2
170 - Ethics
1
200 - Religion
1
330 - Economics
1
363 - Other social problems & services
1
370 - Education
1
600 - Technology
1