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