Classification
340 - Law
551 - Geology, hydrology & meteorology
330 - Economics
2
333 - Economics of land & energy
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
320 - Political science
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1