EarthWorks Geospatial Catalog

North Cascades National Park, Wash. [cartographic material] : and Lake Chelan & Ross Lake National Recreation Areas, 1974 / Mapped, edited, and published by the Geological Survey.

Relief shown by contours and spot heights. "Compiled in 1976 from ... topographic maps dated 1952-1969." "Planimetry revised from aerial photographs taken 1974." "N4815--W12030/45X75."
U.S. Dept. of the Interior, Geological Survey
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