Classification
140 - Specific philosophical schools
900 - History & geography
700 - The arts; fine & decorative arts
4
600 - Technology
3
620 - Engineering & allied operations
3
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
530 - Physics
2
581 - Specific topics in natural history
2
000 - Computer science, information & general works
1
300 - Social sciences
1
301 - Sociology & anthropology
1
320 - Political science
1
340 - Law
1
363 - Other social problems & services
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
720 - Architecture
1