Personal letters chiefly from Army medical officers received largely during Yarrow's tenure at the Army Medical Museum and Surgeon-General's Library. Correspondents include J.H. Baxter, John S. Billings, James Carroll, C.H. Crane, J.M. Cuyler, John Eagen, Robert Fletcher, Charles R. Greenleaf, Charles L. Heizmann, Bernard J. D. Irwin, George A. Otis, J. Simpson, George M. Sternberg, and J.J. Woodward.
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