Classification
610 - Medicine & health
304 - Factors affecting social behavior
32
330 - Economics
15
600 - Technology
8
140 - Specific philosophical schools
7
333 - Economics of land & energy
7
320 - Political science
6
363 - Other social problems & services
5
370 - Education
5
700 - The arts; fine & decorative arts
4
900 - History & geography
4
000 - Computer science, information & general works
3
630 - Agriculture & related technologies
3
100 - Philosophy & psychology
2
300 - Social sciences
2
306 - Culture & institutions
2
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
170 - Ethics
1
200 - Religion
1
301 - Sociology & anthropology
1
340 - Law
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1
800 - Literature & rhetoric
1