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4Published 1930“... with a Diesel engine. It was piloted here from New York by way of California by Brother Feltes. Because...”
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5Published 1936“..., with diesel engines driving caterpillar treads, would be used to make the field explorations from the base...”
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6Published 1929“.... "Radiation from the Diesel engines furnishes all of the heat necessary to keep the mills warm...”
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