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Ventilation of manholes.

Ventilation of manholes.

Published Year

• 1930-1939 (2)

Subject

• Manholes (2)
• Mine ventilation (2) *

Author

• Campbell, John. (2)
• Jones, G. W. (2)
• Miller, W. E. (2) *
• Yant, W. P. (2)

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