Classification
600 - Technology
620 - Engineering & allied operations
900 - History & geography
26
700 - The arts; fine & decorative arts
19
333 - Economics of land & energy
15
000 - Computer science, information & general works
9
363 - Other social problems & services
7
576 - Genetics & evolution
5
610 - Medicine & health
4
330 - Economics
3
380 - Commerce, communications & transportation
3
500 - Natural sciences & mathematics
2
540 - Chemistry & allied sciences
2
580 - Plants (Botany)
2
720 - Architecture
2
304 - Factors affecting social behavior
1
320 - Political science
1
400 - Language
1
530 - Physics
1
770 - Photography, photographs & computer art
1