Classification
620 - Engineering & allied operations
600 - Technology
7
700 - The arts; fine & decorative arts
5
900 - History & geography
5
363 - Other social problems & services
4
610 - Medicine & health
4
330 - Economics
1
333 - Economics of land & energy
1
414 - Phonology & phonetics
1
580 - Plants (Botany)
1
800 - Literature & rhetoric
1