Classification
540 - Chemistry & allied sciences
000 - Computer science, information & general works
80
700 - The arts; fine & decorative arts
70
600 - Technology
42
333 - Economics of land & energy
41
363 - Other social problems & services
39
620 - Engineering & allied operations
35
610 - Medicine & health
28
580 - Plants (Botany)
18
330 - Economics
13
576 - Genetics & evolution
11
630 - Agriculture & related technologies
11
900 - History & geography
11
500 - Natural sciences & mathematics
10
380 - Commerce, communications & transportation
9
140 - Specific philosophical schools
8
414 - Phonology & phonetics
8
530 - Physics
8
800 - Literature & rhetoric
6
581 - Specific topics in natural history
5
304 - Factors affecting social behavior
4
612 - Human physiology
3
615 - Pharmacology & therapeutics
3
320 - Political science
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
100 - Philosophy & psychology
1
361 - Social problems & social welfare in general
1
520 - Astronomy & allied sciences
1
590 - Animals (Zoology)
1