Classification
100 - Philosophy & psychology
170 - Ethics
200 - Religion
300 - Social sciences
1
320 - Political science
330 - Economics
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
370 - Education
380 - Commerce, communications & transportation
610 - Medicine & health
1
658 - General management
1
780 - Music
1
900 - History & geography