Classification
600 - Technology
7
620 - Engineering & allied operations
7
900 - History & geography
7
700 - The arts; fine & decorative arts
5
000 - Computer science, information & general works
4
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
576 - Genetics & evolution
3
330 - Economics
2
580 - Plants (Botany)
2
304 - Factors affecting social behavior
1
320 - Political science
1
540 - Chemistry & allied sciences
1
630 - Agriculture & related technologies
1