Classification
363 - Other social problems & services
8
551 - Geology, hydrology & meteorology
8
600 - Technology
8
620 - Engineering & allied operations
7
000 - Computer science, information & general works
6
333 - Economics of land & energy
6
700 - The arts; fine & decorative arts
6
580 - Plants (Botany)
5
140 - Specific philosophical schools
4
630 - Agriculture & related technologies
4
900 - History & geography
4
330 - Economics
3
581 - Specific topics in natural history
3
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
576 - Genetics & evolution
2
577 - Ecology
2
170 - Ethics
1
304 - Factors affecting social behavior
1
549 - Mineralogy
1
553 - Economic geology
1
628 - Sanitary & municipal engineering
1
657 - Accounting
1