Classification
363 - Other social problems & services
630 - Agriculture & related technologies
600 - Technology
8
620 - Engineering & allied operations
8
330 - Economics
6
333 - Economics of land & energy
5
581 - Specific topics in natural history
4
320 - Political science
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
610 - Medicine & health
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
340 - Law
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
590 - Animals (Zoology)
1
700 - The arts; fine & decorative arts
1