Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
3
620 - Engineering & allied operations
900 - History & geography
3
140 - Specific philosophical schools
2
551 - Geology, hydrology & meteorology
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
333 - Economics of land & energy
1
370 - Education
1
400 - Language
1
580 - Plants (Botany)
1
720 - Architecture
1