Classification
900 - History & geography
300 - Social sciences
3
320 - Political science
3
398 - Folklore
3
200 - Religion
2
330 - Economics
2
410 - Linguistics
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
100 - Philosophy & psychology
1
170 - Ethics
1
301 - Sociology & anthropology
1
363 - Other social problems & services
1
400 - Language
1
414 - Phonology & phonetics
1
610 - Medicine & health
1
800 - Literature & rhetoric
1