Classification
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
20
000 - Computer science, information & general works
19
363 - Other social problems & services
18
333 - Economics of land & energy
17
900 - History & geography
12
580 - Plants (Botany)
11
140 - Specific philosophical schools
9
330 - Economics
9
630 - Agriculture & related technologies
9
380 - Commerce, communications & transportation
6
320 - Political science
5
551 - Geology, hydrology & meteorology
5
576 - Genetics & evolution
5
540 - Chemistry & allied sciences
4
414 - Phonology & phonetics
3
658 - General management
3
340 - Law
2
370 - Education
2
612 - Human physiology
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1