Classification
330 - Economics
5
307 - Communities
4
361 - Social problems & social welfare in general
4
320 - Political science
3
360 - Social problems & services; associations
3
610 - Medicine & health
3
551 - Geology, hydrology & meteorology
2
300 - Social sciences
1
301 - Sociology & anthropology
1
302 - Social interaction
1
305 - Social groups
1
306 - Culture & institutions
1
362 - Social welfare problems & services
1
363 - Other social problems & services
1
371 - Schools & their activities; special education
1
372 - Elementary education
1
500 - Natural sciences & mathematics
1
658 - General management
1