Classification
333 - Economics of land & energy
340 - Law
380 - Commerce, communications & transportation
600 - Technology
5
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
900 - History & geography
363 - Other social problems & services
4
630 - Agriculture & related technologies
3
720 - Architecture
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
170 - Ethics
2
300 - Social sciences
2
330 - Economics
2
370 - Education
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
200 - Religion
1
304 - Factors affecting social behavior
1
551 - Geology, hydrology & meteorology
1