Classification
610 - Medicine & health
7
140 - Specific philosophical schools
5
333 - Economics of land & energy
5
700 - The arts; fine & decorative arts
5
330 - Economics
3
361 - Social problems & social welfare in general
3
500 - Natural sciences & mathematics
3
100 - Philosophy & psychology
2
304 - Factors affecting social behavior
2
380 - Commerce, communications & transportation
2
400 - Language
2
581 - Specific topics in natural history
2
600 - Technology
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
1
363 - Other social problems & services
1
370 - Education
1
590 - Animals (Zoology)
1