Statistics for occurrence #1 of “Dr. Hayes” in alphabetic letter H, entry group 4, entry hayes-isaac-israel of Harper's Encyclopedia of United States History:

... back, and Dr. Hayes, with three companions and two dog-sledges, pressed on to land in lat. 81° 37′, beyond which they discovered open water. The expedition returned to Boston in October. Dr. Hayes found his country in civil war, and he served in it as a surgeon. In 1867 he published an account of his expedition, under the title of ; and the Royal Geographical Society of London and the Geogra...
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