Classification
551 - Geology, hydrology & meteorology
700 - The arts; fine & decorative arts
9
000 - Computer science, information & general works
5
333 - Economics of land & energy
5
363 - Other social problems & services
5
600 - Technology
5
620 - Engineering & allied operations
5
330 - Economics
4
900 - History & geography
4
320 - Political science
3
380 - Commerce, communications & transportation
3
800 - Literature & rhetoric
3
140 - Specific philosophical schools
2
500 - Natural sciences & mathematics
2
530 - Physics
2
576 - Genetics & evolution
2
610 - Medicine & health
2
520 - Astronomy & allied sciences
1
550 - Earth sciences
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
658 - General management
1