[4] Narrative of a Journey Across The Rocky Mountains, to the Columbia River and a Visit to the Sandwich Islands, Chili, &c. With a Scientific Appendix. By John K. Townsend. Philadelphia, 1839.
[5] An unbiased account of Audubon’s efforts to secure these specimens is given in Chapter XXXI, Vol. 2, of Dr. Herrick’s recent historical study ‘Audubon The Naturalist.’ Further light on the subject may be found in a letter from Audubon to Harris under date of Oct. 26. 1837, published in the Auk, Vol. XX, p. 370, by S. N. Rhoads. Audubon has left a full account of his activities at this time in the Introduction to Vol. 4 of the ‘Ornithological Biography.’
[6] Notes from a letter of Edward Harris, Auk, 1895, p. 227, Geo. Spencer Morris.
[7] Reis im Innern Nord-Amerika. 2 Vols. Coblentz, 1839-1841.
[8] Having access only to a reprint of this rare work in which the ornithological matter is largely deleted, I am indebted to Mr. Otto Widmann for this extract which he translated from the original publication.
[9] Travels in the Interior of America in the Years 1809, 1810, & 1811 &c. By J. Bradbury. Liverpool, 1817.
[10] Audubon and His Journals. By Maria R. Audubon. With Zoölogical and other Notes by Elliott Coues. 2 Vols. N. Y., 1900.
[11] The Migration of North American Sparrows. Compiled by Prof. W. W. Cooke, chiefly from data in the Biological Survey. Bird Lore, 1913, p. 301.
[12] The Status of the Harris’s Sparrow in Wisconsin and Neighboring States. By Alvin R. Cahn. Bull. Wis. Nat. Hist. Soc., Vol. XIII, No. 2, pp. 102-108. Also in numerous lists and field notes published in ‘The Auk,’ ‘Wilson Bull.’ and the other bird journals.
[13] The Relation of Sparrows to Agriculture. By Sylvester A. Judd. Bull. Biol. Surv. No. 15, 1901.