Classification
333 - Economics of land & energy
500 - Natural sciences & mathematics
600 - Technology
9
620 - Engineering & allied operations
9
900 - History & geography
700 - The arts; fine & decorative arts
8
330 - Economics
3
610 - Medicine & health
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
340 - Law
2
380 - Commerce, communications & transportation
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
363 - Other social problems & services
1
414 - Phonology & phonetics
1
800 - Literature & rhetoric
1