J.W. Spencer fonds, 1866, 1881-1921
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Fonds consists mostly of correspondence and offprints of technical publications written by Spencer from various journals. The correspondence includes letters from Charles Walcott, R. R. Gurley, Edward Hull, G. K. Gilbert, J. W. Gregory, J. H. McFarland, E. A. Lancaster, Robert Bell, James Wilson, and G. Frederick Wright.