Classification
100 - Philosophy & psychology
170 - Ethics
320 - Political science
330 - Economics
363 - Other social problems & services
551 - Geology, hydrology & meteorology
3
140 - Specific philosophical schools
2
333 - Economics of land & energy
2
700 - The arts; fine & decorative arts
2
300 - Social sciences
1
340 - Law
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
658 - General management
1