. Contributions to the geography of the United States, 1923-1924. Geology; Mines and mineral resources. U. S. GEOLOGICAL SURVEY BtTI,LETIN 760 PLATE XVII. A. GLACIAL BOULDER NORTH OF GILBERTVILLE, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Campbell, Marius R. (Marius Robinson), 1858-1940; Geological Survey (U. S. ). Washington [D. C. ] : U. S. Govt. Print. Off.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeology, booksubjectm