Classification
330 - Economics
370 - Education
610 - Medicine & health
304 - Factors affecting social behavior
17
320 - Political science
11
333 - Economics of land & energy
9
363 - Other social problems & services
7
700 - The arts; fine & decorative arts
7
600 - Technology
5
900 - History & geography
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
361 - Social problems & social welfare in general
3
620 - Engineering & allied operations
3
200 - Religion
2
360 - Social problems & services; associations
2
372 - Elementary education
2
630 - Agriculture & related technologies
2
780 - Music
2
340 - Law
1
350 - Public administration & military science
1
371 - Schools & their activities; special education
1
380 - Commerce, communications & transportation
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
720 - Architecture
1