Union County, Pennsylvania /

Relief shown by contours and spot heights.Alternate title in right lower margin: Union Co., Pa. : N4048--W7648/21X34."Compiled in 1973 from 1:24 000-scale maps.""Experimental printing."In upper margin: United States, Department of the Interior, Geological Survey; Commonwealth of Pennsylvania, Department of Environmental Resources, Topographic and Geologic Survey.Pa. coordinate and UTM grids.Includes notes, "Index to 1:24 000-scale maps," and location map