Classification
320 - Political science
330 - Economics
333 - Economics of land & energy
3
581 - Specific topics in natural history
600 - Technology
900 - History & geography
363 - Other social problems & services
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
170 - Ethics
1
300 - Social sciences
1
350 - Public administration & military science
1
370 - Education
1
380 - Commerce, communications & transportation
1
530 - Physics
1
576 - Genetics & evolution
1