Classification
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
170 - Ethics
333 - Economics of land & energy
2
363 - Other social problems & services
200 - Religion
1
320 - Political science
1
330 - Economics
1
340 - Law
1
370 - Education
1
581 - Specific topics in natural history
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1