Classification
333 - Economics of land & energy
580 - Plants (Botany)
000 - Computer science, information & general works
4
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
2
600 - Technology
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
330 - Economics
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
612 - Human physiology
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1