Classification
330 - Economics
551 - Geology, hydrology & meteorology
333 - Economics of land & energy
8
000 - Computer science, information & general works
6
320 - Political science
6
363 - Other social problems & services
5
700 - The arts; fine & decorative arts
5
140 - Specific philosophical schools
4
600 - Technology
4
581 - Specific topics in natural history
3
380 - Commerce, communications & transportation
2
576 - Genetics & evolution
2
800 - Literature & rhetoric
2
304 - Factors affecting social behavior
1
370 - Education
1
410 - Linguistics
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
900 - History & geography
1