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Ventilation of manholes.

Published Year

• 1940-1949 (1) *

Subject

• Air (1)
• Manholes (1)
• Manholes--Design and construction (1) *
• Manholes--Maintenance and repair (1)

Author

• Campbell, John, (1)
• Jones, G. W. (1)
• Miller, W. E. (1)

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