Title in lower margin: Harford Co., Md. : N3916-W7601.5/28x33.5, 1978. "Compiled from USGS 1:24,000-scale topographic maps dated 1948-1957." "Planimetry revised from aerial photographs taken 1974 and other source data." "1-16170." Available also through the Library of Congress Web site as a raster image.
United States. Soil Conservation Service; Geological Survey (U.S.)
1978
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