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RT @USGS_Pubs: Digital representation of exposures of Precambrian bedrock in parts of Dickinson and Iron Counties, Michigan, and Florence a…
RT @USGS_Pubs: Digital representation of exposures of Precambrian bedrock in parts of Dickinson and Iron Counties, Michigan, and Florence a…
Digital representation of exposures of Precambrian bedrock in parts of Dickinson and Iron Counties, Michigan, and Florence and Marinette Counties, Wisconsin https://t.co/8UKS7T8Rf2 https://t.co/Kxj2MFVMEv