Classification
540 - Chemistry & allied sciences
600 - Technology
620 - Engineering & allied operations
104
700 - The arts; fine & decorative arts
68
363 - Other social problems & services
62
333 - Economics of land & energy
54
900 - History & geography
45
000 - Computer science, information & general works
40
610 - Medicine & health
30
330 - Economics
19
580 - Plants (Botany)
15
576 - Genetics & evolution
13
630 - Agriculture & related technologies
13
140 - Specific philosophical schools
11
500 - Natural sciences & mathematics
11
380 - Commerce, communications & transportation
10
581 - Specific topics in natural history
8
414 - Phonology & phonetics
7
612 - Human physiology
7
370 - Education
6
304 - Factors affecting social behavior
5
551 - Geology, hydrology & meteorology
5
615 - Pharmacology & therapeutics
5
300 - Social sciences
4
320 - Political science
4
400 - Language
3
530 - Physics
3
100 - Philosophy & psychology
2
340 - Law
2
657 - Accounting
2
658 - General management
2
720 - Architecture
2
301 - Sociology & anthropology
1
800 - Literature & rhetoric
1