Classification
320 - Political science
333 - Economics of land & energy
30
363 - Other social problems & services
15
330 - Economics
13
414 - Phonology & phonetics
8
700 - The arts; fine & decorative arts
8
551 - Geology, hydrology & meteorology
7
900 - History & geography
6
380 - Commerce, communications & transportation
4
581 - Specific topics in natural history
4
140 - Specific philosophical schools
3
304 - Factors affecting social behavior
3
630 - Agriculture & related technologies
3
300 - Social sciences
2
370 - Education
2
720 - Architecture
2
200 - Religion
1
301 - Sociology & anthropology
1
340 - Law
1
350 - Public administration & military science
1
400 - Language
1
410 - Linguistics
1
580 - Plants (Botany)
1
610 - Medicine & health
1
800 - Literature & rhetoric
1