Classification
800 - Literature & rhetoric
600 - Technology
6
700 - The arts; fine & decorative arts
5
900 - History & geography
5
100 - Philosophy & psychology
4
333 - Economics of land & energy
4
620 - Engineering & allied operations
4
140 - Specific philosophical schools
3
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
000 - Computer science, information & general works
2
330 - Economics
2
370 - Education
2
720 - Architecture
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
320 - Political science
1
400 - Language
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1