Classification
900 - History & geography
7
700 - The arts; fine & decorative arts
4
300 - Social sciences
3
370 - Education
2
400 - Language
2
410 - Linguistics
2
610 - Medicine & health
2
000 - Computer science, information & general works
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
780 - Music
1
800 - Literature & rhetoric
1