Classification
550 - Earth sciences
600 - Technology
4
620 - Engineering & allied operations
4
900 - History & geography
4
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
000 - Computer science, information & general works
2
320 - Political science
2
414 - Phonology & phonetics
2
530 - Physics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1
770 - Photography, photographs & computer art
1