Classification
540 - Chemistry & allied sciences
000 - Computer science, information & general works
26
333 - Economics of land & energy
17
610 - Medicine & health
17
700 - The arts; fine & decorative arts
17
363 - Other social problems & services
11
576 - Genetics & evolution
10
580 - Plants (Botany)
10
620 - Engineering & allied operations
9
380 - Commerce, communications & transportation
7
551 - Geology, hydrology & meteorology
6
581 - Specific topics in natural history
6
600 - Technology
6
140 - Specific philosophical schools
5
330 - Economics
5
414 - Phonology & phonetics
5
612 - Human physiology
5
304 - Factors affecting social behavior
4
500 - Natural sciences & mathematics
4
530 - Physics
4
300 - Social sciences
3
320 - Political science
2
615 - Pharmacology & therapeutics
2
630 - Agriculture & related technologies
2
340 - Law
1
800 - Literature & rhetoric
1
900 - History & geography
1