Classification
380 - Commerce, communications & transportation
900 - History & geography
7
700 - The arts; fine & decorative arts
6
330 - Economics
4
600 - Technology
4
140 - Specific philosophical schools
2
200 - Religion
2
370 - Education
2
400 - Language
2
410 - Linguistics
2
500 - Natural sciences & mathematics
2
620 - Engineering & allied operations
2
720 - Architecture
2
000 - Computer science, information & general works
1
160 - Logic
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
530 - Physics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
800 - Literature & rhetoric
1