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