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in creator/contributor: "Hirt, Jules H."  
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Primary view of Process of Producing Gas.
Hirt, Jules H.
January 6, 1914
Primary view of Process of Producing Gas.
Hirt, Jules H.
September 15, 1914
Primary view of Process of Producing Gas
Hirt, Jules H.
September 24, 1912
Primary view of Pulverizer.
Hirt, Jules H.
September 17, 1912
Primary view of Gas-Producer
Hirt, Jules H.
February 14, 1910
Primary view of Gas Producer
Hirt, Jules H.
June 17, 1913
Primary view of Gas-Producer.
Hirt, Jules H.
April 28, 1914
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