1956, a book by a man calling himself 'Major Rudolf Lusar' first published in German, then translated into editions around the world.
The book received the following review published in the Washington Post on February 18, 1957: Hitler's Arms Chief Tells of Plan to Bomb U.S. By Super-Plane, Says Reich Had Flying Saucers
(Reuters) MUNICH, West Germany, Feb. 17 - Nazi Germany developed flying saucers that flew more than 1000 miles an hour and a bomber that could attack the United States and return without refueling, it was revealed today. These and other details of Hitler's efforts to achieve a "wonder weapon" that would turn the tide of World War II in its closing stages are revealed authoritatively in a book called "The German Weapons and Secret Weapons of World War II and Their Development," by Rudolf Lusar, who during the war was head of the Technical Arms Department of the German War Ministry. The flying saucers, designed by three German engineers and an Italian, were 138 feet in diameter. The first one flew February. 14, 1945, at Prague, and reached a height of more than 40,000 feet and a speed of 1250 miles per hour... In his book, Lusar said the weapons helped bolster Nazi Propaganda Minister Josef Göbbels in his fanatical belief that a "wonder weapon" would turn the tide at the last minute...