Classification
576 - Genetics & evolution
600 - Technology
17
700 - The arts; fine & decorative arts
17
333 - Economics of land & energy
16
620 - Engineering & allied operations
15
900 - History & geography
15
000 - Computer science, information & general works
10
500 - Natural sciences & mathematics
6
330 - Economics
5
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
304 - Factors affecting social behavior
2
320 - Political science
2
340 - Law
2
414 - Phonology & phonetics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
580 - Plants (Botany)
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
300 - Social sciences
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
612 - Human physiology
1
658 - General management
1