Classification
320 - Political science
370 - Education
400 - Language
900 - History & geography
3
380 - Commerce, communications & transportation
2
410 - Linguistics
2
000 - Computer science, information & general works
1
300 - Social sciences
1
333 - Economics of land & energy
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
600 - Technology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1