Classification
540 - Chemistry & allied sciences
600 - Technology
620 - Engineering & allied operations
27
700 - The arts; fine & decorative arts
21
363 - Other social problems & services
16
333 - Economics of land & energy
14
000 - Computer science, information & general works
12
610 - Medicine & health
6
900 - History & geography
6
330 - Economics
5
576 - Genetics & evolution
5
580 - Plants (Botany)
5
630 - Agriculture & related technologies
5
414 - Phonology & phonetics
4
500 - Natural sciences & mathematics
3
304 - Factors affecting social behavior
2
320 - Political science
2
380 - Commerce, communications & transportation
2
530 - Physics
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
340 - Law
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
612 - Human physiology
1
615 - Pharmacology & therapeutics
1