Classification
600 - Technology
7
620 - Engineering & allied operations
7
900 - History & geography
7
700 - The arts; fine & decorative arts
5
330 - Economics
3
333 - Economics of land & energy
3
370 - Education
2
000 - Computer science, information & general works
1
363 - Other social problems & services
1
414 - Phonology & phonetics
1