Classification
304 - Factors affecting social behavior
610 - Medicine & health
600 - Technology
131
330 - Economics
76
370 - Education
44
320 - Political science
43
333 - Economics of land & energy
35
363 - Other social problems & services
29
700 - The arts; fine & decorative arts
17
000 - Computer science, information & general works
14
140 - Specific philosophical schools
14
630 - Agriculture & related technologies
14
380 - Commerce, communications & transportation
10
580 - Plants (Botany)
7
581 - Specific topics in natural history
7
540 - Chemistry & allied sciences
5
620 - Engineering & allied operations
5
900 - History & geography
5
300 - Social sciences
4
551 - Geology, hydrology & meteorology
4
800 - Literature & rhetoric
4
576 - Genetics & evolution
3
200 - Religion
2
336 - Public finance
2
301 - Sociology & anthropology
1
340 - Law
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
400 - Language
1
414 - Phonology & phonetics
1
520 - Astronomy & allied sciences
1