Classification
333 - Economics of land & energy
6
414 - Phonology & phonetics
700 - The arts; fine & decorative arts
6
000 - Computer science, information & general works
3
600 - Technology
3
380 - Commerce, communications & transportation
2
540 - Chemistry & allied sciences
2
140 - Specific philosophical schools
1
320 - Political science
1
330 - Economics
1
363 - Other social problems & services
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
800 - Literature & rhetoric
1
900 - History & geography
1