Classification
530 - Physics
600 - Technology
333 - Economics of land & energy
9
700 - The arts; fine & decorative arts
8
620 - Engineering & allied operations
7
900 - History & geography
7
000 - Computer science, information & general works
5
551 - Geology, hydrology & meteorology
3
330 - Economics
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
580 - Plants (Botany)
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
170 - Ethics
1
320 - Political science
1
370 - Education
1
581 - Specific topics in natural history
1