Classification
380 - Commerce, communications & transportation
900 - History & geography
17
700 - The arts; fine & decorative arts
16
600 - Technology
15
000 - Computer science, information & general works
13
333 - Economics of land & energy
13
330 - Economics
9
620 - Engineering & allied operations
9
580 - Plants (Botany)
5
363 - Other social problems & services
4
370 - Education
4
576 - Genetics & evolution
4
610 - Medicine & health
4
140 - Specific philosophical schools
3
300 - Social sciences
3
340 - Law
3
414 - Phonology & phonetics
3
530 - Physics
3
800 - Literature & rhetoric
3
304 - Factors affecting social behavior
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
200 - Religion
1
301 - Sociology & anthropology
1
320 - Political science
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
612 - Human physiology
1
630 - Agriculture & related technologies
1
657 - Accounting
1
720 - Architecture
1