. Contributions to the geography of the United States, 1923-1924. Geology; Mines and mineral resources. U. S. GEOLOGICAL SURVEY BULLETIN 7C0 PLATE III. £^j S , n.,^. 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