Classification
320 - Political science
380 - Commerce, communications & transportation
600 - Technology
300 - Social sciences
14
330 - Economics
14
900 - History & geography
14
000 - Computer science, information & general works
11
620 - Engineering & allied operations
10
700 - The arts; fine & decorative arts
9
333 - Economics of land & energy
6
370 - Education
6
140 - Specific philosophical schools
5
340 - Law
5
400 - Language
5
100 - Philosophy & psychology
4
363 - Other social problems & services
4
630 - Agriculture & related technologies
4
200 - Religion
3
304 - Factors affecting social behavior
3
500 - Natural sciences & mathematics
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
780 - Music
3
170 - Ethics
2
410 - Linguistics
2
520 - Astronomy & allied sciences
2
581 - Specific topics in natural history
2
658 - General management
2
301 - Sociology & anthropology
1
350 - Public administration & military science
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
791 - Public performances
1
920 - Biography, genealogy & insignia
1