Classification
320 - Political science
700 - The arts; fine & decorative arts
4
330 - Economics
3
333 - Economics of land & energy
3
900 - History & geography
3
363 - Other social problems & services
2
140 - Specific philosophical schools
1
200 - Religion
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
770 - Photography, photographs & computer art
1
780 - Music
1