Classification
140 - Specific philosophical schools
363 - Other social problems & services
580 - Plants (Botany)
610 - Medicine & health
700 - The arts; fine & decorative arts
21
333 - Economics of land & energy
16
380 - Commerce, communications & transportation
12
000 - Computer science, information & general works
11
600 - Technology
10
330 - Economics
9
620 - Engineering & allied operations
9
551 - Geology, hydrology & meteorology
6
300 - Social sciences
5
540 - Chemistry & allied sciences
5
576 - Genetics & evolution
5
900 - History & geography
5
304 - Factors affecting social behavior
4
340 - Law
4
581 - Specific topics in natural history
4
612 - Human physiology
4
630 - Agriculture & related technologies
4
800 - Literature & rhetoric
4
370 - Education
3
414 - Phonology & phonetics
3
500 - Natural sciences & mathematics
3
170 - Ethics
2
320 - Political science
2
400 - Language
2
615 - Pharmacology & therapeutics
2
658 - General management
2
720 - Architecture
2
297 - Islam, Babism & Bahai Faith
1
530 - Physics
1
657 - Accounting
1