Classification
540 - Chemistry & allied sciences
380 - Commerce, communications & transportation
42
700 - The arts; fine & decorative arts
25
000 - Computer science, information & general works
24
333 - Economics of land & energy
17
610 - Medicine & health
15
140 - Specific philosophical schools
10
363 - Other social problems & services
9
580 - Plants (Botany)
9
576 - Genetics & evolution
7
414 - Phonology & phonetics
6
551 - Geology, hydrology & meteorology
6
612 - Human physiology
6
620 - Engineering & allied operations
6
500 - Natural sciences & mathematics
5
530 - Physics
4
581 - Specific topics in natural history
4
600 - Technology
4
300 - Social sciences
3
900 - History & geography
3
320 - Political science
2
330 - Economics
2
304 - Factors affecting social behavior
1
590 - Animals (Zoology)
1
615 - Pharmacology & therapeutics
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1