Article from the October 3, 2019 issue of Modoc County Record on a U.S. Geological Survey drone conducting a magnetic survey of the subterranean features of Surprise Valley. Click to read the PDF.
Article from the October 3, 2019 issue of Modoc County Record on a U.S. Geological Survey drone conducting a magnetic survey of the subterranean features of Surprise Valley. Click to read the PDF.
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