Classification
000 - Computer science, information & general works
500 - Natural sciences & mathematics
5
700 - The arts; fine & decorative arts
5
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
140 - Specific philosophical schools
2
400 - Language
2
600 - Technology
2
720 - Architecture
2
304 - Factors affecting social behavior
1
320 - Political science
1
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
410 - Linguistics
1
520 - Astronomy & allied sciences
1
530 - Physics
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
900 - History & geography
1