Não informado. (2014). U.S. Geological Survey Professional Paper. U.S. Geological Survey Professional Paper.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. U.S. Geological Survey Professional Paper. Washington: U.S. Geological Survey Professional Paper, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. U.S. Geological Survey Professional Paper. U.S. Geological Survey Professional Paper, 2014.
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