Classification
333 - Economics of land & energy
414 - Phonology & phonetics
540 - Chemistry & allied sciences
000 - Computer science, information & general works
1
330 - Economics
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1