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1928a. Notes. Cardinal, vol. 2, pp. 104-105.

1928b. The birds of Pymatuning Swamp and Conneaut Lake, Crawford County, Pennsylvania. Ann. Carnegie Mus., vol. 18, pp. 19-239.

1930. Notes on the northern pileated woodpecker in Pennsylvania. Cardinal, vol. 2, pp. 207-217.

Swainson, William, and Richardson, John.

1831. Fauna Boreali-Americana, vol. 2. Birds.

Swarth, Harry Schelwaldt.

1904. Birds of the Huachuca Mountains, Arizona. Pacific Coast Avifauna, no. 4.

1911a. Birds and mammals of the 1909 Alexander Alaska expedition. Univ. California Publ. Zool., vol. 7, pp. 9-172.

1911b. Description of a new hairy woodpecker from southeastern Alaska. Univ. California Publ. Zool., vol. 7, pp. 313-318.