Classification
330 - Economics
380 - Commerce, communications & transportation
620 - Engineering & allied operations
600 - Technology
37
900 - History & geography
33
333 - Economics of land & energy
26
700 - The arts; fine & decorative arts
25
363 - Other social problems & services
21
000 - Computer science, information & general works
14
140 - Specific philosophical schools
8
551 - Geology, hydrology & meteorology
8
580 - Plants (Botany)
6
658 - General management
6
340 - Law
5
500 - Natural sciences & mathematics
5
610 - Medicine & health
5
320 - Political science
4
370 - Education
4
576 - Genetics & evolution
4
304 - Factors affecting social behavior
3
630 - Agriculture & related technologies
3
720 - Architecture
2
800 - Literature & rhetoric
2
200 - Religion
1
331 - Labor economics
1
381 - Commerce
1
384 - Communications; telecommunication
1
410 - Linguistics
1
414 - Phonology & phonetics
1
530 - Physics
1
581 - Specific topics in natural history
1
621 - Applied physics
1
657 - Accounting
1