Classification
000 - Computer science, information & general works
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
380 - Commerce, communications & transportation
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
600 - Technology
1
620 - Engineering & allied operations
900 - History & geography
1