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A recent report published by a good friend here at the survey. USGS Pub https://t.co/ZQYsYHwyzj via @USGS_Pubs
A recent report published by a good friend here at the survey. USGS Pub https://t.co/ZQYsYHwyzj via @USGS_Pubs
Geology and mining history of the Southeast Missouri Barite District and the Valles Mines, Missouri https://t.co/omR2tONaz4 https://t.co/TdaImVimss