This is a typed copy of a letter from H. L. C., Supervising Engineer of the Roosevelt Dam construction in Arizona, to C. D. Wolcott, Secretary of the Smithsonian Institute, Washington D. C. The author of the letter says he is enclosing letters from and to topographer Samuel O. Potter, concerning the Salt River Reservoir as ground for exploration, and offering his possible assistance. The letter was originally written on June 8, 1908, but no date exists on the copy.

Louis C. Hill (1865-1938) was the Supervising Engineer for the Roosevelt Dam project.Samuel O. L. Potter traveled as topographer for the engineering department of the U.S. army. He traveled across that part of Arizona now named the Salt River Reservoir, and with some of the soldiers there, discovered graves and ruins of ancient cliff dwellings.

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