Classification
320 - Political science
330 - Economics
333 - Economics of land & energy
551 - Geology, hydrology & meteorology
600 - Technology
363 - Other social problems & services
21
700 - The arts; fine & decorative arts
13
000 - Computer science, information & general works
12
610 - Medicine & health
10
620 - Engineering & allied operations
10
140 - Specific philosophical schools
8
380 - Commerce, communications & transportation
7
304 - Factors affecting social behavior
5
370 - Education
5
581 - Specific topics in natural history
5
630 - Agriculture & related technologies
5
580 - Plants (Botany)
4
658 - General management
4
720 - Architecture
4
900 - History & geography
4
200 - Religion
2
300 - Social sciences
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
297 - Islam, Babism & Bahai Faith
1
336 - Public finance
1
340 - Law
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
576 - Genetics & evolution
1