Classification
140 - Specific philosophical schools
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
3
581 - Specific topics in natural history
1
610 - Medicine & health
3
700 - The arts; fine & decorative arts
3