Classification
520 - Astronomy & allied sciences
500 - Natural sciences & mathematics
477
900 - History & geography
17
530 - Physics
15
700 - The arts; fine & decorative arts
15
000 - Computer science, information & general works
8
300 - Social sciences
8
100 - Philosophy & psychology
7
333 - Economics of land & energy
7
200 - Religion
6
610 - Medicine & health
6
370 - Education
5
600 - Technology
5
140 - Specific philosophical schools
4
320 - Political science
4
330 - Economics
4
720 - Architecture
4
363 - Other social problems & services
3
581 - Specific topics in natural history
3
120 - Epistemology, causation & humankind
2
170 - Ethics
2
301 - Sociology & anthropology
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
620 - Engineering & allied operations
2
800 - Literature & rhetoric
2
160 - Logic
1
304 - Factors affecting social behavior
1
340 - Law
1
380 - Commerce, communications & transportation
1
400 - Language
1
510 - Mathematics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
630 - Agriculture & related technologies
1
658 - General management
1
780 - Music
1