Classification
333 - Economics of land & energy
363 - Other social problems & services
576 - Genetics & evolution
600 - Technology
620 - Engineering & allied operations
900 - History & geography
700 - The arts; fine & decorative arts
9
580 - Plants (Botany)
5
380 - Commerce, communications & transportation
4
414 - Phonology & phonetics
3
610 - Medicine & health
3
720 - Architecture
3
140 - Specific philosophical schools
2
170 - Ethics
2
300 - Social sciences
2
340 - Law
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
000 - Computer science, information & general works
1
500 - Natural sciences & mathematics
1
551 - Geology, hydrology & meteorology
1