Classification
600 - Technology
380 - Commerce, communications & transportation
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
363 - Other social problems & services
2
551 - Geology, hydrology & meteorology
2
720 - Architecture
2
100 - Philosophy & psychology
1
320 - Political science
1
333 - Economics of land & energy
1
520 - Astronomy & allied sciences
1
700 - The arts; fine & decorative arts
1
770 - Photography, photographs & computer art
1