Classification
100 - Philosophy & psychology
363 - Other social problems & services
600 - Technology
700 - The arts; fine & decorative arts
620 - Engineering & allied operations
6
000 - Computer science, information & general works
5
900 - History & geography
5
333 - Economics of land & energy
4
610 - Medicine & health
4
370 - Education
3
320 - Political science
2
330 - Economics
2
500 - Natural sciences & mathematics
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
120 - Epistemology, causation & humankind
1
140 - Specific philosophical schools
1
200 - Religion
1
380 - Commerce, communications & transportation
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1