Classification
333 - Economics of land & energy
340 - Law
581 - Specific topics in natural history
320 - Political science
6
363 - Other social problems & services
5
330 - Economics
3
700 - The arts; fine & decorative arts
3
100 - Philosophy & psychology
2
630 - Agriculture & related technologies
2
140 - Specific philosophical schools
1
170 - Ethics
1
200 - Religion
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
610 - Medicine & health
1
900 - History & geography
1