Classification
330 - Economics
333 - Economics of land & energy
5
363 - Other social problems & services
620 - Engineering & allied operations
600 - Technology
4
900 - History & geography
4
580 - Plants (Botany)
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
370 - Education
1
380 - Commerce, communications & transportation
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1