Date Image Innovation Society
1831 Borden Base Line Borden Base Line ASCE
1817 Cranetown Triangulation Site Cranetown Triangulation Site ASCE
1799 Ellicott's Stone Ellicott's Stone ASCE
1791-1795 Vancouver's Mapping of the West Coast of North America Vancouver's Mapping of the West Coast of North America ASCE
1785 Point of Beginning, U.S. Public Lands Point of Beginning, U.S. Public Lands ASCE
1767 Mason-Dixon Line Mason-Dixon Line ASCE
1728-1821 Emanuel Bowen's 1747 map showing the boundary between Virginia and North Carolina. Royal Colonial Boundary of 1665 ASCE

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