Classification
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
580 - Plants (Botany)
2
600 - Technology
2
320 - Political science
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
530 - Physics
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
900 - History & geography
1