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Effect of vertical ducts in combination with openings in manhole covers on the natural ventilation

Title:Effect of vertical ducts in combination with openings in manhole covers on the natural ventilation
Alternate title:Ventilation of manholes. [No.] 4., Effect of vertical ducts in combination with openings in manhole covers on the natural ventilation
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Note:U.S. Dept. of the Interior, Bureau of Mines, 1940
  
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Subject:Air
Subject:Manholes
Subject:Manholes -- Design and construction
Subject:Manholes -- Maintenance and repair
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