Preliminary geologic map of the Silverton 7.5-minute quadrangle, San Juan County, Colorado [cartographic material] / U.S. Department of the Interior, U.S. Geological Survey ; by Robert G. Luedke and Wilbur S. Burbank
Distributed to depository libraries in microfiche. Shipping list no.: 98-0398-M. Includes 1 index map in text. Relief shown by contours and spot heights.
Bibliography Note
Text includes bibliographical references (leaves 8-10).
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