Classification
330 - Economics
363 - Other social problems & services
600 - Technology
333 - Economics of land & energy
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
620 - Engineering & allied operations
2
000 - Computer science, information & general works
1
340 - Law
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1