Classification
363 - Other social problems & services
600 - Technology
6
333 - Economics of land & energy
4
620 - Engineering & allied operations
4
900 - History & geography
4
330 - Economics
3
000 - Computer science, information & general works
2
380 - Commerce, communications & transportation
2
700 - The arts; fine & decorative arts
2
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1