Classification
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
900 - History & geography
22
333 - Economics of land & energy
19
000 - Computer science, information & general works
17
380 - Commerce, communications & transportation
14
330 - Economics
12
363 - Other social problems & services
11
610 - Medicine & health
6
140 - Specific philosophical schools
5
580 - Plants (Botany)
5
630 - Agriculture & related technologies
5
658 - General management
5
720 - Architecture
5
370 - Education
4
551 - Geology, hydrology & meteorology
4
576 - Genetics & evolution
4
320 - Political science
3
500 - Natural sciences & mathematics
3
304 - Factors affecting social behavior
2
400 - Language
2
530 - Physics
2
540 - Chemistry & allied sciences
2
200 - Religion
1
300 - Social sciences
1
340 - Law
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1