Classification
000 - Computer science, information & general works
300 - Social sciences
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
320 - Political science
1
333 - Economics of land & energy
1
370 - Education
1
400 - Language
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1