Classification
540 - Chemistry & allied sciences
000 - Computer science, information & general works
80
700 - The arts; fine & decorative arts
66
333 - Economics of land & energy
36
363 - Other social problems & services
32
600 - Technology
30
610 - Medicine & health
24
620 - Engineering & allied operations
23
580 - Plants (Botany)
15
900 - History & geography
13
576 - Genetics & evolution
11
330 - Economics
10
630 - Agriculture & related technologies
9
140 - Specific philosophical schools
8
380 - Commerce, communications & transportation
7
414 - Phonology & phonetics
7
530 - Physics
7
800 - Literature & rhetoric
7
500 - Natural sciences & mathematics
5
304 - Factors affecting social behavior
4
581 - Specific topics in natural history
4
612 - Human physiology
3
615 - Pharmacology & therapeutics
3
520 - Astronomy & allied sciences
2
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
100 - Philosophy & psychology
1
320 - Political science
1
340 - Law
1
361 - Social problems & social welfare in general
1
590 - Animals (Zoology)
1