Relief shown by contours and spot heights. Alternate title at lower right: Delaware Co., Pa. : 39075-H4-CF-050 : 1991. "Map edited 1991." 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. Available also through the Library of Congress Web site as a raster image.
Geological Survey (U.S.); Pennsylvania. Bureau Of Topographic And Geologic Survey
1991
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/92683909/">https://www.loc.gov/item/92683909/</a>