Classification
380 - Commerce, communications & transportation
620 - Engineering & allied operations
600 - Technology
52
900 - History & geography
50
700 - The arts; fine & decorative arts
43
333 - Economics of land & energy
34
000 - Computer science, information & general works
17
140 - Specific philosophical schools
16
363 - Other social problems & services
15
576 - Genetics & evolution
13
330 - Economics
12
610 - Medicine & health
10
500 - Natural sciences & mathematics
9
720 - Architecture
8
551 - Geology, hydrology & meteorology
6
540 - Chemistry & allied sciences
5
580 - Plants (Botany)
5
320 - Political science
4
340 - Law
4
414 - Phonology & phonetics
4
581 - Specific topics in natural history
4
612 - Human physiology
4
300 - Social sciences
3
370 - Education
3
800 - Literature & rhetoric
3
530 - Physics
2
658 - General management
2
304 - Factors affecting social behavior
1
400 - Language
1