+Harry Dolphin Posted March 12, 2016 Share Posted March 12, 2016 Stumbled on this one near the Francis E. Walter Dam in Carbon County PA. Not in the Geocaching list of benchmarks. But I thought it interesting. A GPS Survey Monument. Quote Link to comment
Bill93 Posted March 14, 2016 Share Posted March 14, 2016 I've happened across several similar ones. Many counties have contracted out the placement of such marks to base their GIS systems on. Quote Link to comment
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