Asa Gray correspondence. Senders Ho-Hy
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By: Gray, Asa, - Holm, Theo. (Theodor), - Holmes, Oliver Wendell, - Holton, Isaac F. (Isaac Farwell) - Holzinger, J. M. (John Michael), - Hooper, Edward William, - Horsford, Frederick Hinsdale, - Howell, Joseph, - Howell, Thomas, - Humphreys, A.