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by Leffingwell, Ernest de K. 1875-1971,
Published: Department of the Interior, United States Geological Survey, 1919
Description: 1 online resource (251 pages) : illustrations, maps.
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by Leffingwell, Ernest de K. 1875-1971.
Published: Govt. print. off., 1919
Description: 251 pages : illustrations, XXXV plates (part folded; including maps in pocket) diagrams ; 29 cm.
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