Rippelmeyer. Giant City State Park and the Civilian Conservation Corps. Southern Illinois University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRippelmeyer. Giant City State Park and the Civilian Conservation Corps. Southern Illinois University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRippelmeyer. Giant City State Park and the Civilian Conservation Corps. Southern Illinois University Press.
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