Classification
520 - Astronomy & allied sciences
000 - Computer science, information & general works
11
530 - Physics
10
500 - Natural sciences & mathematics
9
700 - The arts; fine & decorative arts
9
333 - Economics of land & energy
7
600 - Technology
6
900 - History & geography
5
576 - Genetics & evolution
4
100 - Philosophy & psychology
3
320 - Political science
3
330 - Economics
3
363 - Other social problems & services
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
140 - Specific philosophical schools
1
170 - Ethics
1
200 - Religion
1
297 - Islam, Babism & Bahai Faith
1
300 - Social sciences
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1