Classification
551 - Geology, hydrology & meteorology
580 - Plants (Botany)
000 - Computer science, information & general works
4
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
363 - Other social problems & services
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
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1