The National Geographic Magazine, Volume CXI, Number Four (April, 1957).
Illustrated by Jack Potter (Coca Cola ad on back o. Soft Cover, Washington: National Geographic Society, 1957. Very Good with no dust jacket.
Illustrated by Jack Potter (Coca Cola ad on back o. Soft Cover, Washington: National Geographic Society, 1957. Very Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1959. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1961. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1959. Good with no dust jacket.
Illustrated by Jack Potter (Coca Cola ad on back o. Soft Cover, Washington: National Geographic Society, 1957. Very 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.
Soft Cover, Washington, D.C. National Geographic Society, 1958. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1959. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1959. Good with no dust jacket.
Soft Cover, Washington, D.C. 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, 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, 1958. Good with no dust jacket.
Soft Cover, Washington: National Geographic Society, 1958. Good with no dust jacket.
Hardcover, Nairobi: Patwa News Agency Ltd., 1956. Sixth Printing. Good in Fair dust jacket.
Hardcover, Guilford, Connecticut: Lyons Press, 2004. First Edition; First Printing. Fine in Fine dust jacket.
Softcover, Chicago: Joint Publication Board of Zygon, 2000. Fine with no dust jacket.
Softcover, Chicago: Joint Publication Board of Zygon, 2006. Very Good with No dust jacket as issued.
Softcover, Chicago: Joint Publication Board of Zygon, 2007. Good with No dust jacket as issued.
Softcover, Chicago: University of Chicago Press, 1983. First Edition; First Printing. Very Good with no dust jacket.
Hardcover, New York: Random House, Inc., 1992. First Edition; First Printing. Very Good in Good dust jacket.