Classification
330 - Economics
53
320 - Political science
36
340 - Law
24
370 - Education
4
900 - History & geography
4
304 - Factors affecting social behavior
3
700 - The arts; fine & decorative arts
3
300 - Social sciences
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
400 - Language
2
005 - Computer programming, programs & data
1
301 - Sociology & anthropology
1
305 - Social groups
1
331 - Labor economics
1
332 - Financial economics
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
600 - Technology
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1