Classification
100 - Philosophy & psychology
320 - Political science
363 - Other social problems & services
333 - Economics of land & energy
9
700 - The arts; fine & decorative arts
8
610 - Medicine & health
7
170 - Ethics
5
300 - Social sciences
5
330 - Economics
5
600 - Technology
5
900 - History & geography
5
551 - Geology, hydrology & meteorology
4
581 - Specific topics in natural history
4
620 - Engineering & allied operations
4
630 - Agriculture & related technologies
4
140 - Specific philosophical schools
3
200 - Religion
3
576 - Genetics & evolution
3
000 - Computer science, information & general works
2
340 - Law
2
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
1
580 - Plants (Botany)
1
658 - General management
1