Classification
600 - Technology
35
620 - Engineering & allied operations
35
900 - History & geography
700 - The arts; fine & decorative arts
22
333 - Economics of land & energy
18
330 - Economics
7
000 - Computer science, information & general works
6
363 - Other social problems & services
6
576 - Genetics & evolution
5
340 - Law
3
500 - Natural sciences & mathematics
3
580 - Plants (Botany)
3
380 - Commerce, communications & transportation
2
414 - Phonology & phonetics
2
120 - Epistemology, causation & humankind
1
400 - Language
1
530 - Physics
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1
800 - Literature & rhetoric
1