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