Classification
900 - History & geography
363 - Other social problems & services
2
370 - Education
2
700 - The arts; fine & decorative arts
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
398 - Folklore
1
410 - Linguistics
1
600 - Technology
1