Classification
333 - Economics of land & energy
6
340 - Law
581 - Specific topics in natural history
320 - Political science
4
363 - Other social problems & services
4
100 - Philosophy & psychology
2
200 - Religion
2
330 - Economics
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
170 - Ethics
1
300 - Social sciences
1
301 - Sociology & anthropology
1
380 - Commerce, communications & transportation
1
600 - Technology
1
610 - Medicine & health
1
900 - History & geography
1