Classification
000 - Computer science, information & general works
333 - Economics of land & energy
3
580 - Plants (Botany)
600 - Technology
330 - Economics
2
363 - Other social problems & services
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
380 - Commerce, communications & transportation
1
540 - Chemistry & allied sciences
1
620 - Engineering & allied operations
1