Classification
320 - Political science
380 - Commerce, communications & transportation
900 - History & geography
600 - Technology
31
700 - The arts; fine & decorative arts
25
330 - Economics
24
620 - Engineering & allied operations
24
363 - Other social problems & services
19
333 - Economics of land & energy
17
000 - Computer science, information & general works
15
300 - Social sciences
12
720 - Architecture
11
140 - Specific philosophical schools
10
370 - Education
10
200 - Religion
8
340 - Law
8
551 - Geology, hydrology & meteorology
8
301 - Sociology & anthropology
6
400 - Language
6
610 - Medicine & health
6
581 - Specific topics in natural history
5
100 - Philosophy & psychology
4
500 - Natural sciences & mathematics
4
576 - Genetics & evolution
4
410 - Linguistics
3
550 - Earth sciences
3
658 - General management
3
780 - Music
3
304 - Factors affecting social behavior
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
170 - Ethics
1
414 - Phonology & phonetics
1
657 - Accounting
1
800 - Literature & rhetoric
1