Classification
600 - Technology
330 - Economics
7
320 - Political science
6
333 - Economics of land & energy
6
000 - Computer science, information & general works
4
140 - Specific philosophical schools
3
363 - Other social problems & services
3
551 - Geology, hydrology & meteorology
3
700 - The arts; fine & decorative arts
3
370 - Education
2
380 - Commerce, communications & transportation
2
620 - Engineering & allied operations
2
900 - History & geography
2
100 - Philosophy & psychology
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1