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Beal, F. E. L. 1918. Food habits of the swallows, a family of valuable native birds. U. S. Department of Agriculture Bulletin 619.

Bird, Henry. 1917. New species and histories in Papaipema (Lepidoptera) no. 19. Can. Ent. XLIX: pp. 120-128.

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Robinson, B.A. 1917. A monograph of the genus Brickellia. Memoirs of the Gray Herbarium 1: 1-155.

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Seale, A. 1917. The mosquito fish, Gambusia affinis (Baird and Girard) in the Phillippine Islands. Phillippine J. Sci. 12:177-87.

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Burns, F.L. 1915. The Cape May Warbler (DENDROICA TIGRINA) as an abundant autumnal migrant and as a destructive grape juice consumer at Berwyn, PA. Auk 32:231-233.

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Griffiths, D. 1914. New species of Opuntia. Proceedings of Biological Society of Washington 27: 23-28.

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Grinnell, J., and H. S. Swarth. 1913. An account of the birds and mammals of the San Jacinto area of southern California. University of California Publications in Zoology 10:197-406.

Wooton, E.O. and P.C. Standley. 1913. New Plants from New Mexico. Contributions from the National Herbarium. Volume 16. No 4. 1 p.

Bailey, H. H. 1913. The Birds of Virginia. J. P. Bell Co., Inc., Lynchburg, Virginia. 362 pp.

McAtee, W. L., and F. E. L. Beal. 1912. Some common game, aquatic, and rapacious birds in relation to man. USDA Farmers' Bull. 497. 30 pp.

Lefevre, G. and W.T. Curtis. 1912. Studies on the reproduction and artificial propogation of fresh-water mussels. Bulletin of the Bureau of Fisheries 30:102-201.

Sclater, W. L. 1912. A history of the birds of Colorado. Witherby and Company, London, England.

Beal, F. E. L. 1912. Food of our more important flycatchers. U.S. Department of Agriculture, Biological Survey Bulletin 44. 67 pp.

Forbush, E.H. 1912. A history of game birds, wild-fowl and shore birds of Massachusetts and adjacent states. Wright and Potter, Boston.

Hollister, N. 1911. A systematic synopsis of the muskrats. North American Fauna 32:1-47.

Herrick, F.H. 1910. Life and behavior of the cuckoo. J. Exper. Zool. 9:169-233.

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Smith, J.B. 1910. Insects of New Jersey. Annual Report of The New Jersey State Museum for 1909. Trenton, NJ. 888 PP.

Eastwood, Alice. 1909. Synopsis of the Mexican and Central American species of Castilleja. Proc. Amer. Acad. Arts 44: 563-591.

Gilman, M. F. 1909. Among the thrashers in Arizona. Condor 11:49-54.

Cameron, E.S. 1908. The birds of Custer and Dawson counties, Montana. Auk 25:39-56.

Heimerl, A. 1908. Two new species of Abronia. Smithsonian Misc. Coll. 52: 197-198.

Knight, O.W. 1908. The Birds of Maine with Key to and Description of the Various Species Known to Occur or to Have Occurred in the State, an Account of Their Distribution and Migration, Showing Their Relative Abundance in the Various Counties of the State

Smith, B. G. 1908. The spawning habits of Chrosomus erythrogaster (Rafinesque). Biological Bulletin 15:9-18.