Classification
620 - Engineering & allied operations
630 - Agriculture & related technologies
600 - Technology
37
300 - Social sciences
10
900 - History & geography
10
320 - Political science
7
363 - Other social problems & services
7
330 - Economics
5
580 - Plants (Botany)
4
100 - Philosophy & psychology
3
140 - Specific philosophical schools
3
333 - Economics of land & energy
3
581 - Specific topics in natural history
3
610 - Medicine & health
3
551 - Geology, hydrology & meteorology
2
700 - The arts; fine & decorative arts
2
800 - Literature & rhetoric
2
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
340 - Law
1
364 - Criminology
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
576 - Genetics & evolution
1
590 - Animals (Zoology)
1