Geologic map of the Piru quadrangle [cartographic material] : Ventura County, California / by Thomas W. Dibblee, Jr. ; edited by Helmut E. Ehrenspeck ; prepared in cooperation with the U.S. Forest Service, Los Padres National Forest; California Department of Conservation, Division of Mines and Geology; and U.S. Geological Survey.
- Relief shown by contours and spot heights. "Contour interval 40 feet" Includes col. cross section and location map.
- Dibblee Geological Foundation
- Held by
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