80-G-465384:  MacMillan Arctic Expedition, 1925.  As per original caption, “Chief Aerographer Francis and Mr. Gayer of the National Geographic Society demonstrating the effects of eating polar-bear steaks.”   This expedition was noted for the first productive use of aircraft in an Arctic exploration by Americans.  The three aircraft were NA-1, NA-2, and NA-3.  (2015/10/27).
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