Classification
330 - Economics
900 - History & geography
320 - Political science
29
100 - Philosophy & psychology
9
333 - Economics of land & energy
9
700 - The arts; fine & decorative arts
9
380 - Commerce, communications & transportation
6
576 - Genetics & evolution
6
800 - Literature & rhetoric
6
300 - Social sciences
5
301 - Sociology & anthropology
5
340 - Law
5
140 - Specific philosophical schools
4
200 - Religion
3
363 - Other social problems & services
3
551 - Geology, hydrology & meteorology
3
600 - Technology
3
610 - Medicine & health
3
658 - General management
3
304 - Factors affecting social behavior
2
400 - Language
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
000 - Computer science, information & general works
1
170 - Ethics
1
297 - Islam, Babism & Bahai Faith
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
370 - Education
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
720 - Architecture
1
791 - Public performances
1