Classification
304 - Factors affecting social behavior
414 - Phonology & phonetics
620 - Engineering & allied operations
3
333 - Economics of land & energy
2
363 - Other social problems & services
2
580 - Plants (Botany)
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
610 - Medicine & health
1