Classification
000 - Computer science, information & general works
4
400 - Language
363 - Other social problems & services
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
380 - Commerce, communications & transportation
2
600 - Technology
2
620 - Engineering & allied operations
2
720 - Architecture
2
333 - Economics of land & energy
1
370 - Education
1
581 - Specific topics in natural history
1
900 - History & geography
1