Classification
330 - Economics
326
370 - Education
149
800 - Literature & rhetoric
107
900 - History & geography
107
700 - The arts; fine & decorative arts
68
410 - Linguistics
52
400 - Language
50
320 - Political science
44
780 - Music
36
576 - Genetics & evolution
24
363 - Other social problems & services
22
340 - Law
18
333 - Economics of land & energy
17
380 - Commerce, communications & transportation
12
100 - Philosophy & psychology
11
304 - Factors affecting social behavior
9
610 - Medicine & health
8
301 - Sociology & anthropology
6
600 - Technology
6
630 - Agriculture & related technologies
6
200 - Religion
5
300 - Social sciences
4
336 - Public finance
4
891 - East Indo-European & Celtic literatures
4
414 - Phonology & phonetics
3
398 - Folklore
2
658 - General management
2
000 - Computer science, information & general works
1
160 - Logic
1
306 - Culture & institutions
1
384 - Communications; telecommunication
1
450 - Italian, Romanian & related languages
1
620 - Engineering & allied operations
1
972 - Middle America; Mexico
1