Classification
304 - Factors affecting social behavior
610 - Medicine & health
330 - Economics
122
320 - Political science
27
370 - Education
24
333 - Economics of land & energy
16
363 - Other social problems & services
14
600 - Technology
11
380 - Commerce, communications & transportation
7
140 - Specific philosophical schools
5
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
3
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
100 - Philosophy & psychology
1
336 - Public finance
1
340 - Law
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
364 - Criminology
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
800 - Literature & rhetoric
1
900 - History & geography
1