Classification
414 - Phonology & phonetics
6
333 - Economics of land & energy
5
363 - Other social problems & services
5
340 - Law
4
551 - Geology, hydrology & meteorology
4
900 - History & geography
4
000 - Computer science, information & general works
3
304 - Factors affecting social behavior
2
140 - Specific philosophical schools
1
320 - Political science
1
370 - Education
1
380 - Commerce, communications & transportation
1
580 - Plants (Botany)
1
600 - Technology
1
610 - Medicine & health
1
615 - Pharmacology & therapeutics
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1