Classification
304 - Factors affecting social behavior
380 - Commerce, communications & transportation
600 - Technology
620 - Engineering & allied operations
900 - History & geography
6
333 - Economics of land & energy
4
363 - Other social problems & services
4
700 - The arts; fine & decorative arts
4
330 - Economics
3
370 - Education
2
576 - Genetics & evolution
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
200 - Religion
1
340 - Law
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1