Classification
550 - Earth sciences
320 - Political science
5
000 - Computer science, information & general works
4
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
330 - Economics
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
900 - History & geography
3
333 - Economics of land & energy
2
600 - Technology
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
370 - Education
1
576 - Genetics & evolution
1
658 - General management
1
720 - Architecture
1