Classification
140 - Specific philosophical schools
630 - Agriculture & related technologies
600 - Technology
24
620 - Engineering & allied operations
21
000 - Computer science, information & general works
18
333 - Economics of land & energy
18
700 - The arts; fine & decorative arts
17
330 - Economics
16
610 - Medicine & health
16
363 - Other social problems & services
13
380 - Commerce, communications & transportation
10
900 - History & geography
10
320 - Political science
8
300 - Social sciences
7
580 - Plants (Botany)
6
170 - Ethics
5
576 - Genetics & evolution
5
581 - Specific topics in natural history
5
658 - General management
4
100 - Philosophy & psychology
3
340 - Law
3
500 - Natural sciences & mathematics
3
551 - Geology, hydrology & meteorology
3
301 - Sociology & anthropology
2
304 - Factors affecting social behavior
2
370 - Education
2
720 - Architecture
2
800 - Literature & rhetoric
2
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1
612 - Human physiology
1
780 - Music
1