Classification
320 - Political science
580 - Plants (Botany)
630 - Agriculture & related technologies
000 - Computer science, information & general works
2
330 - Economics
2
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
140 - Specific philosophical schools
1
300 - Social sciences
1
304 - Factors affecting social behavior
1
363 - Other social problems & services
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1
900 - History & geography
1