Não informado. Techniques of Water Resources Investigations of the United States Geological Survey.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Techniques of Water Resources Investigations of the United States Geological Survey.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Techniques of Water Resources Investigations of the United States Geological Survey.
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