Classification
320 - Political science
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
900 - History & geography
600 - Technology
17
620 - Engineering & allied operations
14
333 - Economics of land & energy
13
363 - Other social problems & services
13
330 - Economics
12
000 - Computer science, information & general works
11
720 - Architecture
10
140 - Specific philosophical schools
7
370 - Education
7
610 - Medicine & health
6
551 - Geology, hydrology & meteorology
5
340 - Law
4
576 - Genetics & evolution
4
300 - Social sciences
3
400 - Language
3
500 - Natural sciences & mathematics
3
581 - Specific topics in natural history
3
100 - Philosophy & psychology
2
410 - Linguistics
2
630 - Agriculture & related technologies
2
658 - General management
2
780 - Music
2
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
550 - Earth sciences
1
580 - Plants (Botany)
1
800 - Literature & rhetoric
1