Classification
363 - Other social problems & services
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
3
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
720 - Architecture
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
320 - Political science
1
330 - Economics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1