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R.H. Mathews to Frederick Fraley, 1897 May
Robert Hamilton Mathews to Isaac Minis Hays, 1897 September 27
Robert Hamilton Mathews to APS, 1897 October 14
Robert Hamilton Mathews to Isaac Minis Hays, 1898 February 11
Robert Hamilton Mathews to Harrison Allen, 1897
Robert Hamilton Mathews to Isaac Minis Hays, 1898 February 3
R. H. (Robert Hamilton) Mathews to American Philosophical Society, 1898 July 31
R. H. (Robert Hamilton) Matthews to J [sic] Minis Hays, 1898 February 24
Harrison Allen to Isaac Minis Hays, 1897 June 1
Harrison Allen to the American Philosophical Society, May 7, 1897
R. H. (Robert Hamilton) Mathews to J [sic] Minis Hays, 1898 March 5
R. H. (Robert Hamilton) Mathews to I[saac] Minis Hays, 1898 October 4
Robert Hamilton Mathews to Isaac Minis Hays, 1898 January 27