Antique 1877 US Coast Survey Map Maryland to Georgia Primary Triangulation Chart For Sale

Antique 1877 US Coast Survey Map Maryland to Georgia Primary Triangulation ChartThis authentic antique map illustrates the historical scientific triangulation framework created by the U.S. Coast Survey along the Eastern Seaboard (spanning from Maryland through Virginia, the Carolinas, down to Georgia). It includes detailed triangulation networks, baseline markings, stations, and key regional geographic points.It measures 18.5" by 26.5".