Classification
333 - Economics of land & energy
363 - Other social problems & services
370 - Education
600 - Technology
620 - Engineering & allied operations
900 - History & geography
13
330 - Economics
12
700 - The arts; fine & decorative arts
11
000 - Computer science, information & general works
6
320 - Political science
6
380 - Commerce, communications & transportation
5
551 - Geology, hydrology & meteorology
5
610 - Medicine & health
5
300 - Social sciences
3
340 - Law
3
400 - Language
3
500 - Natural sciences & mathematics
3
720 - Architecture
3
140 - Specific philosophical schools
2
530 - Physics
2
540 - Chemistry & allied sciences
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
658 - General management
2
800 - Literature & rhetoric
2
200 - Religion
1
304 - Factors affecting social behavior
1
657 - Accounting
1