Classification
100 - Philosophy & psychology
140 - Specific philosophical schools
2
320 - Political science
333 - Economics of land & energy
363 - Other social problems & services
170 - Ethics
1
330 - Economics
1
340 - Law
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
600 - Technology
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1