House documents, 81st Congress. 216. Yellowstone River and tributaries, Wyo., Mont., and N. Dak., letter from chief of engineers. Army, submitting report on review of reports on, and preliminary examinations and surreys of Yellowstone River and tributaries, Wyo., Mont., and N. Dak., Including Big Horn River and tributaries, Powder River and tributaries, and North and South Fork of Shoshone River and tributaries, Wyo., and Big Horn Canyon reservoir, Mont.

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