EarthWorks Geospatial Catalog

1:25,000-scale metric topographic map of ... California [cartographic material] / produced by the United States Geological Survey in cooperation with State of California.

Relief shown by spot heights and contours; contour intervals 20 meters. "Compiled by photogrammetric methods from aerial photographs taken 1976. Field check 1978." Includes Conversion table, Declination diagram and Adjoining maps.
The Geological Survey
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