Classification
620 - Engineering & allied operations
600 - Technology
27
700 - The arts; fine & decorative arts
18
900 - History & geography
17
333 - Economics of land & energy
12
580 - Plants (Botany)
10
000 - Computer science, information & general works
8
610 - Medicine & health
6
380 - Commerce, communications & transportation
5
540 - Chemistry & allied sciences
5
363 - Other social problems & services
4
630 - Agriculture & related technologies
4
330 - Economics
3
414 - Phonology & phonetics
2
500 - Natural sciences & mathematics
2
304 - Factors affecting social behavior
1
340 - Law
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1