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.
Soft Cover, Cambridge: Museum of Comparative Zoology, Harvard, 1952. Very Good with no dust jacket.
Hardcover, Wien: Umweltbundesamt, 1993. Very Good with no dust jacket.
Softcover, Blacksburg, Virginia: Virginia Polytechnical Institute and State University, 1984. Very Good with no dust jacket.
Illustrated by Carolyn Hoss. Softcover, United States: John O. Fussell III, 1985. Good with no dust jacket.
Softcover, San Marino, California: Henry E. Huntington Library and Art Gallery, 1998. Very Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1955. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1955. Very Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1944. Very Good with no dust jacket.
Softcover, Washington, D.C. National Geographic Society, 1934. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1953. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1932. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1950. Very Good with no dust jacket.
Softcover, Washington, D.C. National Geographic Society, 1937. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1932. Good with no dust jacket.
Softcover, Washington, D.C. National Geographic Society, 1930. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1959. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1959. Very Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1959. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1957. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1958. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1958. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1958. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1964. Very Good with no dust jacket.
Hardcover, New York: Alfred A. Knopf, 1972. First American Edition. Very Good in Good dust jacket.