Classification
610 - Medicine & health
72
330 - Economics
20
700 - The arts; fine & decorative arts
12
363 - Other social problems & services
8
100 - Philosophy & psychology
3
370 - Education
3
600 - Technology
3
333 - Economics of land & energy
2
630 - Agriculture & related technologies
2
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1