Classification
304 - Factors affecting social behavior
363 - Other social problems & services
576 - Genetics & evolution
600 - Technology
2
620 - Engineering & allied operations
800 - Literature & rhetoric
2
900 - History & geography
000 - Computer science, information & general works
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
610 - Medicine & health
1