Classification
304 - Factors affecting social behavior
551 - Geology, hydrology & meteorology
330 - Economics
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
700 - The arts; fine & decorative arts
3
320 - Political science
2
380 - Commerce, communications & transportation
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
600 - Technology
1
620 - Engineering & allied operations
1