Classification
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
400 - Language
610 - Medicine & health
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
320 - Political science
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
600 - Technology
1
620 - Engineering & allied operations
1
720 - Architecture
1
900 - History & geography
1