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266 Among his publications are "A History of North American Birds " (co-author with Professor S. F. Baird and Doctor T. M. Brewer, 1874, 3 volumes, pertaining to land birds only), and "Water Birds of North America" (1884, 2 volumes); author of "Nomenclature of Colors" (1886); "Ornithology of Illinois" (1889, 2 volumes); "The Birds of North and Middle America" (1901, 8 volumes, the fourth volume to appear in 1906); and more than four hundred and fifty papers on subjects of interest in ornithology. A new work on "Standards of Color" is (1906) in course of preparation.

Mr. Ridgway was married to Julia Evelyn Perkins, October 12, 1875.