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