Classification
000 - Computer science, information & general works
4
140 - Specific philosophical schools
540 - Chemistry & allied sciences
610 - Medicine & health
4
612 - Human physiology
300 - Social sciences
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
414 - Phonology & phonetics
3
500 - Natural sciences & mathematics
3
551 - Geology, hydrology & meteorology
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3