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