Classification
333 - Economics of land & energy
6
380 - Commerce, communications & transportation
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
6
330 - Economics
4
610 - Medicine & health
4
720 - Architecture
4
320 - Political science
3
363 - Other social problems & services
3
600 - Technology
3
370 - Education
2
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
658 - General management
1
900 - History & geography
1