Classification
330 - Economics
551 - Geology, hydrology & meteorology
11
363 - Other social problems & services
10
000 - Computer science, information & general works
9
700 - The arts; fine & decorative arts
7
600 - Technology
6
630 - Agriculture & related technologies
6
320 - Political science
5
333 - Economics of land & energy
5
580 - Plants (Botany)
5
620 - Engineering & allied operations
5
380 - Commerce, communications & transportation
4
581 - Specific topics in natural history
3
140 - Specific philosophical schools
2
414 - Phonology & phonetics
2
576 - Genetics & evolution
2
170 - Ethics
1
304 - Factors affecting social behavior
1
610 - Medicine & health
1
657 - Accounting
1
900 - History & geography
1