. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Bui. 348, U. S. Dept. of Agriculture. Plate Fig. 1.âSandstone. «v,*;y* .â *â¢.** **.*» -*4 Fig. 2.âChert. SEDIMENTARY 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.

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