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