Classification
300 - Social sciences
330 - Economics
363 - Other social problems & services
600 - Technology
333 - Economics of land & energy
12
320 - Political science
9
620 - Engineering & allied operations
7
610 - Medicine & health
6
700 - The arts; fine & decorative arts
6
370 - Education
4
900 - History & geography
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
380 - Commerce, communications & transportation
3
630 - Agriculture & related technologies
3
100 - Philosophy & psychology
2
200 - Religion
2
301 - Sociology & anthropology
2
340 - Law
2
350 - Public administration & military science
2
400 - Language
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
581 - Specific topics in natural history
2
304 - Factors affecting social behavior
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
650 - Management & auxiliary services
1
657 - Accounting
1
658 - General management
1