Classification
140 - Specific philosophical schools
333 - Economics of land & energy
2
540 - Chemistry & allied sciences
600 - Technology
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
900 - History & geography
000 - Computer science, information & general works
1
330 - Economics
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
400 - Language
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1