Classification
400 - Language
15
900 - History & geography
8
410 - Linguistics
7
370 - Education
5
500 - Natural sciences & mathematics
5
100 - Philosophy & psychology
3
333 - Economics of land & energy
3
340 - Law
3
700 - The arts; fine & decorative arts
2
800 - Literature & rhetoric
2
304 - Factors affecting social behavior
1
320 - Political science
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
610 - Medicine & health
1
780 - Music
1