Classification
620 - Engineering & allied operations
28
600 - Technology
13
333 - Economics of land & energy
9
700 - The arts; fine & decorative arts
8
900 - History & geography
7
540 - Chemistry & allied sciences
5
000 - Computer science, information & general works
4
541 - Physical chemistry
4
005 - Computer programming, programs & data
3
363 - Other social problems & services
3
530 - Physics
3
580 - Plants (Botany)
3
610 - Medicine & health
3
330 - Economics
2
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
621 - Applied physics
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
414 - Phonology & phonetics
1
628 - Sanitary & municipal engineering
1
690 - Buildings
1