Classification
000 - Computer science, information & general works
551 - Geology, hydrology & meteorology
363 - Other social problems & services
8
333 - Economics of land & energy
7
700 - The arts; fine & decorative arts
7
330 - Economics
6
610 - Medicine & health
6
140 - Specific philosophical schools
3
320 - Political science
3
600 - Technology
3
380 - Commerce, communications & transportation
2
550 - Earth sciences
2
581 - Specific topics in natural history
2
620 - Engineering & allied operations
2
900 - History & geography
2
170 - Ethics
1
370 - Education
1
400 - Language
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1