Classification
600 - Technology
620 - Engineering & allied operations
32
700 - The arts; fine & decorative arts
27
900 - History & geography
26
333 - Economics of land & energy
23
000 - Computer science, information & general works
17
363 - Other social problems & services
11
576 - Genetics & evolution
7
330 - Economics
6
580 - Plants (Botany)
5
380 - Commerce, communications & transportation
4
610 - Medicine & health
4
414 - Phonology & phonetics
3
500 - Natural sciences & mathematics
3
540 - Chemistry & allied sciences
3
530 - Physics
2
720 - Architecture
2
304 - Factors affecting social behavior
1
320 - Political science
1
400 - Language
1
770 - Photography, photographs & computer art
1
800 - Literature & rhetoric
1