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17 Cooper, J.G. Haywards, Cala. Diller, J.S. U.S. Geol. Survey. Dominion Geological Survey, Ottawa, Canada. Dugés Prof. Alfred Mexico Flint, Dr. Earl. Nicaragua. Greegor, Isaiah. Jacksonville, Fla. Greely, Gen. A.W. U.S.A. Heilprin, Prof. A. Philadelphia, Pa. Hemphill, H. San Diego, Cala. Henshall, Mrs. Jas. A. Cynthiana, Ky. Hitchcock, Prof. C.H. Hanover, N.H. Hodge, C.F. Baltimore, Md. Jones, E.E. Sewanee, Tenn. Leidy, Prof. J. Philadelphia, Pa. McCormick, Dr. J.L. Tennessee. Mazyck, W.G. Charleston, S.C. Merriam, Dr. C.H. Washington, D.C. Mexican Geographical Commission, Puebla, Mexico