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Wild Blue Yonder

其他書名	An Air Epic
出版	Superior Publishing Company, 1972
URL	http://books.google.com.hk/books?id=6rTvAAAAMAAJ&hl=&source=gbs_api

註釋"...It in the story of the 300 "Warbirds" who dashed up to Canada in the mid-summer of 1917 to win their wings under the tutelage of the Royal Flying Corps, Canada. Later they would help form the nucleus of the U.S. Air Force. As a reward they are the only U.S. fliers in history who are preveleged to sport a gold "U.S." insignia on their pilot's wings.."--Author's note, page [7]