Classification
300 - Social sciences
320 - Political science
370 - Education
500 - Natural sciences & mathematics
900 - History & geography
380 - Commerce, communications & transportation
2
600 - Technology
2
620 - Engineering & allied operations
2
100 - Philosophy & psychology
1
333 - Economics of land & energy
1
400 - Language
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1