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Showing 1 to 1 of 1 for “"Minnesota caves"”.
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The nitrate deposits of rock crevices in the Upper Mississippi Valley
… Pierre-Charles Le Sueur's 1700 report of caves containing saltpeter (potassium nitrate) along the Minnesota shore of Lake Pepin, this study located what are thought to be the original caves and revealed a hitherto unsuspected widespread district of cave nitrate deposits in the Upper …