Classification
551 - Geology, hydrology & meteorology
360 - Social problems & services; associations
5
320 - Political science
4
363 - Other social problems & services
3
610 - Medicine & health
3
330 - Economics
2
361 - Social problems & social welfare in general
2
370 - Education
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
000 - Computer science, information & general works
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
400 - Language
1
620 - Engineering & allied operations
1