Classification
140 - Specific philosophical schools
363 - Other social problems & services
2
370 - Education
380 - Commerce, communications & transportation
400 - Language
2
600 - Technology
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
720 - Architecture
2
900 - History & geography
000 - Computer science, information & general works
1
330 - Economics
1