Classification
540 - Chemistry & allied sciences
600 - Technology
6
620 - Engineering & allied operations
900 - History & geography
333 - Economics of land & energy
2
363 - Other social problems & services
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
330 - Economics
1
370 - Education
1
500 - Natural sciences & mathematics
1
610 - Medicine & health
1