Classification
380 - Commerce, communications & transportation
5
576 - Genetics & evolution
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
500 - Natural sciences & mathematics
4
600 - Technology
4
900 - History & geography
4
140 - Specific philosophical schools
3
320 - Political science
3
340 - Law
3
363 - Other social problems & services
3
720 - Architecture
3
333 - Economics of land & energy
2
000 - Computer science, information & general works
1
551 - Geology, hydrology & meteorology
1