Classification
363 - Other social problems & services
551 - Geology, hydrology & meteorology
900 - History & geography
140 - Specific philosophical schools
2
330 - Economics
2
700 - The arts; fine & decorative arts
2
300 - Social sciences
1
333 - Economics of land & energy
1
370 - Education
1
600 - Technology
1
620 - Engineering & allied operations
1
720 - Architecture
1