Classification
551 - Geology, hydrology & meteorology
600 - Technology
700 - The arts; fine & decorative arts
333 - Economics of land & energy
9
363 - Other social problems & services
8
610 - Medicine & health
7
330 - Economics
6
380 - Commerce, communications & transportation
6
900 - History & geography
6
000 - Computer science, information & general works
5
320 - Political science
4
720 - Architecture
4
370 - Education
3
620 - Engineering & allied operations
3
576 - Genetics & evolution
2
140 - Specific philosophical schools
1
400 - Language
1
530 - Physics
1
658 - General management
1
800 - Literature & rhetoric
1