Split Seconds in the Lives of Birds. Article published in National Geographic Magazine, Volume 105, Number 5 (May, 1954), pp. 681-706.
Ephemera, Washington, D.C. National Geographic Society, 1954. Good with no dust jacket.
Ephemera, Washington, D.C. National Geographic Society, 1954. Good with no dust jacket.
Hardcover, Cortina, Italy: Edizioni La Cooperativa di Cortina, 1997. Very Good with no dust jacket.
Hardcover, Zurich, Switzerland: Edition Skylight, 2006. Third Edition. Very Good with no dust jacket.
Softcover, Udine, Italy: Forum, Editrice Universitaria Udinese srl, 2010. Very Good with no dust jacket.
Soft Cover, New York: Metropolitan Museum of Art, 1999. Very Good with no dust jacket.
Hardcover, Stuttgart/Berlin/Leipzig: Union Deutsche Verlagsgesellschaft, 1925. Good with no dust jacket.
Illustrated by Steve Dunwell. Hardcover, Durham, North Carolina: Duke University, 1983. Second Printing. Fine in Near Fine dust jacket.
Softcover, Québec: Croix-Rouge canadienne, Division du Québec; Canadian Red Cross Quebec Division, 1998. Very Good- with no dust jacket.
Softcover, Chicago: Gravure Illustrations Co., 1924. Very Good with no dust jacket.
Soft Cover, New York: Metropolitan Museum of Art, 1988. Very Good with no dust jacket.
Softcover, Paris: Musée d'Orsay, 1994. Very Good with no dust jacket.
Hardcover, Bloomington, Indiana: Indiana University Press, 1980. Good+ in Good+ dust jacket.
Softcover, London: Illustrated London News and Sketch, Ltd., 1918. Good with no dust jacket.
Softcover, London: Illustrated London News and Sketch, Ltd., 1918. Fair with no dust jacket.
Softcover, Lexington: The University Press of Kentucky, 2004. Very Good with no dust jacket.
Softcover, Washington, D. C. Library of Congress, 1961. Good with no dust jacket.
Ephemera, Washington, D.C. Library of Congress, 1961. Good+ with no dust jacket.
Soft Cover, New York: Metropolitan Museum of Art, 1978. Very Good with no dust jacket.
Softcover, Albuquerque, New Mexico: University of New Mexico Art Museum, 1972. Very Good with no dust jacket.
Softcover, Köln: Zeigler Beckmann, N.D. Good with no dust jacket.
Softcover, Chapel Hill: The University of North Carolina Press, 1997. Very Good with no dust jacket.
Illustrated by Bayard Wootten. Hardcover, New York: Houghton Mifflin Company, 1937. Numbered. Good+ with no dust jacket.
Softcover, Toronto: Art Gallery of Ontario, 1985. Very Good- with no dust jacket.
Illustrated by Bill Thomas. Hardcover, Bloomington, Indiana: Indiana University Press, 1981. First Edition. Good+ in Good+ dust jacket.
Ephemera, Unknown: Unknown, 1916. Very Good with no dust jacket.