Classification
320 - Political science
330 - Economics
551 - Geology, hydrology & meteorology
333 - Economics of land & energy
20
363 - Other social problems & services
19
600 - Technology
17
700 - The arts; fine & decorative arts
13
000 - Computer science, information & general works
11
610 - Medicine & health
10
620 - Engineering & allied operations
8
380 - Commerce, communications & transportation
7
581 - Specific topics in natural history
6
900 - History & geography
6
630 - Agriculture & related technologies
5
140 - Specific philosophical schools
3
370 - Education
3
658 - General management
3
200 - Religion
2
300 - Social sciences
2
304 - Factors affecting social behavior
2
580 - Plants (Botany)
2
720 - Architecture
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
360 - Social problems & services; associations
1
414 - Phonology & phonetics
1
576 - Genetics & evolution
1