Classification
330 - Economics
333 - Economics of land & energy
2
363 - Other social problems & services
2
581 - Specific topics in natural history
600 - Technology
620 - Engineering & allied operations
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
320 - Political science
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1