Classification
320 - Political science
330 - Economics
82
900 - History & geography
21
333 - Economics of land & energy
16
300 - Social sciences
13
700 - The arts; fine & decorative arts
11
340 - Law
9
304 - Factors affecting social behavior
8
363 - Other social problems & services
8
600 - Technology
7
370 - Education
6
610 - Medicine & health
6
630 - Agriculture & related technologies
5
140 - Specific philosophical schools
4
200 - Religion
4
100 - Philosophy & psychology
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
336 - Public finance
2
530 - Physics
2
170 - Ethics
1
360 - Social problems & services; associations
1
364 - Criminology
1
400 - Language
1
410 - Linguistics
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
720 - Architecture
1