Classification
140 - Specific philosophical schools
320 - Political science
2
330 - Economics
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
600 - Technology
700 - The arts; fine & decorative arts
2
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
900 - History & geography
1