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200 1 $a<<A >>method of trapping the dust produced by pneumatic rock drills$fBy P.S. Hay.
210   $aLondon$cHis Majesty's Stationery Office$d1926
215   $a18 p., ill., tav., 24 cm
300   $aIn testa al front.: Mines Department
676   $a622
700  1$aHay,$bPeter Stewart
712 02$aMines Department
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