Classification
600 - Technology
4
000 - Computer science, information & general works
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
333 - Economics of land & energy
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
612 - Human physiology
1
620 - Engineering & allied operations
1
900 - History & geography
1