Block Island quadrangle [cartographic material] : Rhode Island - Washington Co. / mapped by the Army Map Service ; edited and published by the Geological Survey.
Description
"Photorevised 1970." Relief shown by contours and spot heights. "Map photoinspected 1975. No major culture or drainage changes observed." "Control by USGS and USC&GS." "AMS 6666 II NE - Series V815." "Topography by planetable surveys 1923 with revision from aerial photographs in 1943. Culture revised by the Geological Survey 1957." "Contour interval 10 feet." 1 inch = approx. 4/10 mile. Includes quadrangle location map.
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