Classification
000 - Computer science, information & general works
380 - Commerce, communications & transportation
8
500 - Natural sciences & mathematics
610 - Medicine & health
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
6
576 - Genetics & evolution
6
620 - Engineering & allied operations
6
140 - Specific philosophical schools
5
363 - Other social problems & services
4
540 - Chemistry & allied sciences
4
580 - Plants (Botany)
4
600 - Technology
4
612 - Human physiology
4
300 - Social sciences
3
414 - Phonology & phonetics
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
900 - History & geography
2
330 - Economics
1
340 - Law
1
410 - Linguistics
1