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 as issued.
Ephemera, Washington, D.C. National Geographic Society, 1954. Good with No dust jacket as issued.
Soft Cover, Washington: National Geographic Society, 1944. Very Good with no dust jacket.
Softcover, Washington, D.C. National Geographic Society, 1946. Good with No dust jacket as issued.
Softcover, Washington, D.C. National Geographic Society, 1937. Good with No dust jacket as issued.
Soft Cover, Washington: National Geographic Society, 1945. Very Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1948. Very Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1943. Fair with no dust jacket.