Classification
540 - Chemistry & allied sciences
620 - Engineering & allied operations
102
600 - Technology
99
700 - The arts; fine & decorative arts
40
333 - Economics of land & energy
27
363 - Other social problems & services
23
330 - Economics
19
580 - Plants (Botany)
11
610 - Medicine & health
11
630 - Agriculture & related technologies
10
000 - Computer science, information & general works
9
500 - Natural sciences & mathematics
8
380 - Commerce, communications & transportation
7
320 - Political science
4
340 - Law
4
576 - Genetics & evolution
4
414 - Phonology & phonetics
3
530 - Physics
3
900 - History & geography
3
140 - Specific philosophical schools
2
300 - Social sciences
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
720 - Architecture
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
400 - Language
1
615 - Pharmacology & therapeutics
1