Não informado. (1949). Engineering report. Iowa Engineering Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Engineering Report. Ames, Iowa: Iowa Engineering Experiment Station, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Engineering Report. Iowa Engineering Experiment Station, 1949.
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