Classification
300 - Social sciences
320 - Political science
330 - Economics
363 - Other social problems & services
333 - Economics of land & energy
17
600 - Technology
12
700 - The arts; fine & decorative arts
12
900 - History & geography
10
551 - Geology, hydrology & meteorology
9
140 - Specific philosophical schools
8
000 - Computer science, information & general works
6
301 - Sociology & anthropology
6
581 - Specific topics in natural history
6
340 - Law
5
380 - Commerce, communications & transportation
5
100 - Philosophy & psychology
4
620 - Engineering & allied operations
4
200 - Religion
3
370 - Education
3
610 - Medicine & health
3
304 - Factors affecting social behavior
2
350 - Public administration & military science
2
576 - Genetics & evolution
2
630 - Agriculture & related technologies
2
120 - Epistemology, causation & humankind
1
170 - Ethics
1
400 - Language
1
410 - Linguistics
1
650 - Management & auxiliary services
1
657 - Accounting
1
800 - Literature & rhetoric
1