Classification
380 - Commerce, communications & transportation
551 - Geology, hydrology & meteorology
000 - Computer science, information & general works
2
580 - Plants (Botany)
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1