Classification
170 - Ethics
330 - Economics
320 - Political science
30
333 - Economics of land & energy
29
100 - Philosophy & psychology
27
140 - Specific philosophical schools
23
363 - Other social problems & services
21
600 - Technology
18
700 - The arts; fine & decorative arts
17
300 - Social sciences
16
000 - Computer science, information & general works
14
610 - Medicine & health
13
900 - History & geography
13
200 - Religion
11
370 - Education
10
620 - Engineering & allied operations
10
380 - Commerce, communications & transportation
9
551 - Geology, hydrology & meteorology
8
581 - Specific topics in natural history
6
340 - Law
5
658 - General management
5
301 - Sociology & anthropology
4
361 - Social problems & social welfare in general
3
297 - Islam, Babism & Bahai Faith
2
304 - Factors affecting social behavior
2
350 - Public administration & military science
2
500 - Natural sciences & mathematics
2
630 - Agriculture & related technologies
2
720 - Architecture
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1
414 - Phonology & phonetics
1
530 - Physics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
657 - Accounting
1