Classification
304 - Factors affecting social behavior
320 - Political science
333 - Economics of land & energy
2
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
1
330 - Economics
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
540 - Chemistry & allied sciences
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1