Classification
140 - Specific philosophical schools
000 - Computer science, information & general works
17
700 - The arts; fine & decorative arts
16
600 - Technology
15
330 - Economics
12
900 - History & geography
10
320 - Political science
9
380 - Commerce, communications & transportation
9
610 - Medicine & health
9
333 - Economics of land & energy
7
300 - Social sciences
6
363 - Other social problems & services
6
170 - Ethics
5
620 - Engineering & allied operations
5
100 - Philosophy & psychology
4
370 - Education
4
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
658 - General management
3
720 - Architecture
3
120 - Epistemology, causation & humankind
2
400 - Language
2
500 - Natural sciences & mathematics
2
630 - Agriculture & related technologies
2
770 - Photography, photographs & computer art
2
800 - Literature & rhetoric
2
200 - Religion
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
530 - Physics
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
780 - Music
1