Classification
140 - Specific philosophical schools
363 - Other social problems & services
900 - History & geography
330 - Economics
2
551 - Geology, hydrology & meteorology
2
700 - The arts; fine & decorative arts
2
100 - Philosophy & psychology
1
170 - Ethics
1
200 - Religion
1
300 - Social sciences
1
320 - Political science
1
333 - Economics of land & energy
1
370 - Education
1
600 - Technology
1
620 - Engineering & allied operations
1
720 - Architecture
1