The Historical Society of Glastonbury, along with several expert archaeologists, use #GSSI #GPR to help look for colliers’ (coal-makers) artifacts in Blackledge Falls, Connecticut. http://ow.ly/5Ghz50vMbWv #archaeology #archaeologygeophysics #gssigpr
source https://twitter.com/GSSI_GPR/status/1166715835886514177
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