Classification
333 - Economics of land & energy
380 - Commerce, communications & transportation
620 - Engineering & allied operations
600 - Technology
29
700 - The arts; fine & decorative arts
27
900 - History & geography
27
000 - Computer science, information & general works
10
576 - Genetics & evolution
8
363 - Other social problems & services
7
140 - Specific philosophical schools
6
610 - Medicine & health
6
330 - Economics
5
500 - Natural sciences & mathematics
5
540 - Chemistry & allied sciences
4
551 - Geology, hydrology & meteorology
4
580 - Plants (Botany)
4
581 - Specific topics in natural history
4
612 - Human physiology
4
300 - Social sciences
3
414 - Phonology & phonetics
3
720 - Architecture
2
800 - Literature & rhetoric
2
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
530 - Physics
1