Classification
333 - Economics of land & energy
2
380 - Commerce, communications & transportation
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
900 - History & geography
000 - Computer science, information & general works
1
363 - Other social problems & services
1
530 - Physics
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
650 - Management & auxiliary services
1