Classification
600 - Technology
7
620 - Engineering & allied operations
7
900 - History & geography
700 - The arts; fine & decorative arts
5
380 - Commerce, communications & transportation
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
300 - Social sciences
1
320 - Political science
1
333 - Economics of land & energy
1
340 - Law
1
363 - Other social problems & services
1
414 - Phonology & phonetics
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1