Classification
333 - Economics of land & energy
600 - Technology
4
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
3
330 - Economics
2
363 - Other social problems & services
2
610 - Medicine & health
2
900 - History & geography
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
657 - Accounting
1
780 - Music
1