Pennsylvania-Maryland : Gettysburg battlefield and vicinity / U.S. Geological Survey.Geological Survey (U.S.)1913"Engraved Dec. 1910 by U.S.G.S.""Surveyed in 1885 and 1906-1909 in cooperation with the states of Pennsylvania and Maryland."Datum is mean sea level.Gettysburg, Fairfield, Emmitsburg, and Taneytown atlas sheets combined in this map.Relief shown by contours and spot heights. Contour interval 20 feet.cartographic