Classification
000 - Computer science, information & general works
330 - Economics
333 - Economics of land & energy
363 - Other social problems & services
380 - Commerce, communications & transportation
551 - Geology, hydrology & meteorology
5
700 - The arts; fine & decorative arts
5
320 - Political science
4
140 - Specific philosophical schools
2
600 - Technology
2
630 - Agriculture & related technologies
2
300 - Social sciences
1
370 - Education
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography
1