Classification
304 - Factors affecting social behavior
363 - Other social problems & services
173
610 - Medicine & health
147
330 - Economics
74
320 - Political science
61
333 - Economics of land & energy
52
370 - Education
28
630 - Agriculture & related technologies
25
600 - Technology
23
380 - Commerce, communications & transportation
20
700 - The arts; fine & decorative arts
19
000 - Computer science, information & general works
16
140 - Specific philosophical schools
10
900 - History & geography
9
336 - Public finance
8
576 - Genetics & evolution
8
300 - Social sciences
5
580 - Plants (Botany)
5
620 - Engineering & allied operations
5
200 - Religion
4
551 - Geology, hydrology & meteorology
4
581 - Specific topics in natural history
4
800 - Literature & rhetoric
4
540 - Chemistry & allied sciences
3
100 - Philosophy & psychology
2
301 - Sociology & anthropology
2
340 - Law
2
361 - Social problems & social welfare in general
2
400 - Language
2
414 - Phonology & phonetics
2
720 - Architecture
2
170 - Ethics
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
770 - Photography, photographs & computer art
1
780 - Music
1
920 - Biography, genealogy & insignia
1