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