Classification
333 - Economics of land & energy
000 - Computer science, information & general works
7
700 - The arts; fine & decorative arts
7
530 - Physics
6
500 - Natural sciences & mathematics
4
363 - Other social problems & services
3
540 - Chemistry & allied sciences
3
140 - Specific philosophical schools
2
330 - Economics
2
380 - Commerce, communications & transportation
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
600 - Technology
2
304 - Factors affecting social behavior
1
320 - Political science
1
340 - Law
1
410 - Linguistics
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1