David Starr Jordan: Manual of the vertebrates of the northern United States, including the district east of the Mississippi River, and north of North Carolina and Tennessee, exclusive of marine species. (Online)
Walter Koelz: Coregonid Fishes of the Great Lakes. 1929. (Online)
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Donald A. Normandeau: The Life history of the round whitefish Prosopium cylindraceum (Pallas) of Newfound Lake, New Hampshire. 1963. Doctoral Dissertations. 789. (Online)