Classification
610 - Medicine & health
720 - Architecture
900 - History & geography
4
333 - Economics of land & energy
3
363 - Other social problems & services
3
600 - Technology
3
000 - Computer science, information & general works
2
320 - Political science
2
330 - Economics
2
370 - Education
2
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
700 - The arts; fine & decorative arts
2
300 - Social sciences
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1