Classification
600 - Technology
7
620 - Engineering & allied operations
7
900 - History & geography
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
000 - Computer science, information & general works
2
330 - Economics
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
304 - Factors affecting social behavior
1
320 - Political science
1
630 - Agriculture & related technologies
1