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