Classification
304 - Factors affecting social behavior
370 - Education
600 - Technology
330 - Economics
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
320 - Political science
1
620 - Engineering & allied operations
1
780 - Music
1