Johnson's claim was supported by Elliott Coues, who had edited Pike's journal; with his endorsement, it was accepted by the Kansas State Historical Society.
New Light on the Early History of the Greater Northwest: The Manuscript Journals of Alexander Henry, Fur Trader of the Northwest Company and of David Thompson, Official Geographer and Explorer of the Same Company, 1799-1814 (1897);
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In August 1883, with Elliott Coues and William Brewster, he sent the letter inviting selected individuals to form the American Ornithological Union at a meeting to be held in September.