Classification
600 - Technology
620 - Engineering & allied operations
900 - History & geography
17
700 - The arts; fine & decorative arts
13
000 - Computer science, information & general works
5
530 - Physics
4
333 - Economics of land & energy
3
340 - Law
3
363 - Other social problems & services
3
500 - Natural sciences & mathematics
3
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
320 - Political science
1
400 - Language
1
550 - Earth sciences
1