Classification
320 - Political science
610 - Medicine & health
19
333 - Economics of land & energy
17
363 - Other social problems & services
14
700 - The arts; fine & decorative arts
14
330 - Economics
13
600 - Technology
9
140 - Specific philosophical schools
8
000 - Computer science, information & general works
7
370 - Education
7
380 - Commerce, communications & transportation
7
300 - Social sciences
6
100 - Philosophy & psychology
5
551 - Geology, hydrology & meteorology
5
581 - Specific topics in natural history
4
620 - Engineering & allied operations
4
900 - History & geography
4
340 - Law
3
361 - Social problems & social welfare in general
3
630 - Agriculture & related technologies
3
170 - Ethics
2
580 - Plants (Botany)
2
720 - Architecture
2
780 - Music
2
304 - Factors affecting social behavior
1
400 - Language
1
500 - Natural sciences & mathematics
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
658 - General management
1