Classification
600 - Technology
620 - Engineering & allied operations
17
900 - History & geography
15
700 - The arts; fine & decorative arts
13
330 - Economics
11
000 - Computer science, information & general works
10
320 - Political science
10
333 - Economics of land & energy
10
363 - Other social problems & services
9
380 - Commerce, communications & transportation
7
610 - Medicine & health
6
580 - Plants (Botany)
5
630 - Agriculture & related technologies
5
340 - Law
4
304 - Factors affecting social behavior
3
370 - Education
3
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
140 - Specific philosophical schools
1
300 - Social sciences
1
301 - Sociology & anthropology
1
612 - Human physiology
1
658 - General management
1
720 - Architecture
1