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