Classification
610 - Medicine & health
304 - Factors affecting social behavior
18
330 - Economics
10
900 - History & geography
7
320 - Political science
4
140 - Specific philosophical schools
2
370 - Education
2
600 - Technology
2
300 - Social sciences
1
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1