Classification
900 - History & geography
5
800 - Literature & rhetoric
3
200 - Religion
2
300 - Social sciences
2
304 - Factors affecting social behavior
2
380 - Commerce, communications & transportation
2
400 - Language
2
410 - Linguistics
2
700 - The arts; fine & decorative arts
2
320 - Political science
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
398 - Folklore
1
414 - Phonology & phonetics
1
600 - Technology
1
620 - Engineering & allied operations
1