Classification
520 - Astronomy & allied sciences
500 - Natural sciences & mathematics
497
530 - Physics
27
700 - The arts; fine & decorative arts
25
900 - History & geography
21
333 - Economics of land & energy
16
000 - Computer science, information & general works
15
320 - Political science
11
330 - Economics
11
300 - Social sciences
10
600 - Technology
10
100 - Philosophy & psychology
9
610 - Medicine & health
9
200 - Religion
8
576 - Genetics & evolution
7
363 - Other social problems & services
6
800 - Literature & rhetoric
6
140 - Specific philosophical schools
5
370 - Education
5
720 - Architecture
4
301 - Sociology & anthropology
3
380 - Commerce, communications & transportation
3
540 - Chemistry & allied sciences
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
658 - General management
3
120 - Epistemology, causation & humankind
2
170 - Ethics
2
551 - Geology, hydrology & meteorology
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
160 - Logic
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
340 - Law
1
400 - Language
1
410 - Linguistics
1
510 - Mathematics
1
780 - Music
1