Classification
360 - Social problems & services; associations
363 - Other social problems & services
370 - Education
330 - Economics
2
610 - Medicine & health
2
140 - Specific philosophical schools
1
170 - Ethics
1
333 - Economics of land & energy
1
361 - Social problems & social welfare in general
1
551 - Geology, hydrology & meteorology
1
600 - Technology
1
780 - Music
1