Classification
000 - Computer science, information & general works
300 - Social sciences
320 - Political science
330 - Economics
380 - Commerce, communications & transportation
600 - Technology
3
700 - The arts; fine & decorative arts
3
900 - History & geography
3
100 - Philosophy & psychology
2
340 - Law
2
370 - Education
2
620 - Engineering & allied operations
2
170 - Ethics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
400 - Language
1
410 - Linguistics
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
658 - General management
1
780 - Music
1
791 - Public performances
1
800 - Literature & rhetoric
1