Classification
630 - Agriculture & related technologies
600 - Technology
9
330 - Economics
5
333 - Economics of land & energy
4
551 - Geology, hydrology & meteorology
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
000 - Computer science, information & general works
2
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
576 - Genetics & evolution
2
610 - Medicine & health
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
304 - Factors affecting social behavior
1
320 - Political science
1
370 - Education
1
380 - Commerce, communications & transportation
1
520 - Astronomy & allied sciences
1
540 - Chemistry & allied sciences
1
720 - Architecture
1