Classification
551 - Geology, hydrology & meteorology
000 - Computer science, information & general works
7
580 - Plants (Botany)
6
333 - Economics of land & energy
3
330 - Economics
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
320 - Political science
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
1
800 - Literature & rhetoric
1