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1855 Explorations and surveys for a rail road route from the Mississippi River to the Pacific Ocean, route near the 38th & 39th parallels / from explorations and surveys made under the direction of the Hon. Jefferson Davis, Secretary of War, by Capt. J. W. Gunnison, Top. Eng., assisted by E. G. Beckwith, 3d artillery : F. W. Egloffstein, topographer for the route

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