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The National Geographic Magazine, Volume LXXXVII 87 , Number Four 4 April 1945 | Frederick Jr. Simpich, Eric Underwood, W. Robert Moore
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The National Geographic Magazine, Volume 94, Number 3 September 1948 | Gilbert Grosvenor, Maurice Ewing, John Walker, Thomas R
Paul Walker - "It was so humbling being up against something so massive and powerful. If a great white shark doesn't intimidate you, you're crazy." - Paul Walker on participating in National
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The National Geographic Magazine, Volume 97, Number 6 June, 1950 | Gilbert Grosvenor, Leo A. Borah, John Walker, Enzo
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The National Geographic Magazine, Volume CXI, Number Six June, 1957 | Melville Bell Grosvenor, George C. Marshall, Howell Walker
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National Geographic Guide to America's Outdoors: Alaska (Pre-Owned Paperback 9780792277477) by Tom Walker, Nan Elliot - Walmart.com
![National Geographic Magazine, July 1972: Euell Gibbons, Thomas J. Abercrombie, Howell Walker: Amazon.com: Books National Geographic Magazine, July 1972: Euell Gibbons, Thomas J. Abercrombie, Howell Walker: Amazon.com: Books](https://m.media-amazon.com/images/I/51neAhj6izL._AC_UF1000,1000_QL80_.jpg)
National Geographic Magazine, July 1972: Euell Gibbons, Thomas J. Abercrombie, Howell Walker: Amazon.com: Books
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The National Geographic Magazine, 109, Number 2 February 1956 | Gilbert Grosvenor, Jacques-Yves Cousteau, Luis Marden, John Scofield
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The National Geographic Magazine, Volume 96, Number 6 (December 1949) by Grosvenor, Gilbert (ed.); Williams, Maynard Owen; Mountford, Charles P.; Walker, Howell; Sutherland, Mason; Locke, Justin; Blood, Ned: Good with no dust
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