Classification
610 - Medicine & health
320 - Political science
8
333 - Economics of land & energy
4
306 - Culture & institutions
3
330 - Economics
3
551 - Geology, hydrology & meteorology
3
900 - History & geography
3
120 - Epistemology, causation & humankind
2
300 - Social sciences
2
304 - Factors affecting social behavior
2
350 - Public administration & military science
2
380 - Commerce, communications & transportation
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
301 - Sociology & anthropology
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
410 - Linguistics
1
600 - Technology
1