Classification
100 - Philosophy & psychology
363 - Other social problems & services
900 - History & geography
140 - Specific philosophical schools
1
170 - Ethics
1
200 - Religion
1
333 - Economics of land & energy
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
600 - Technology
1
700 - The arts; fine & decorative arts
1