Não informado. (1945). Station paper. U.S. Lake States Forest Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Station Paper. Washington: U.S. Lake States Forest Experiment Station, 1945.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Station Paper. U.S. Lake States Forest Experiment Station, 1945.
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