21:00Letter from America by Alistair CookeThe atom bomb warning of 1939BBC Radio 4 Duration: 15 minutes Sat 8th Aug 1970, 21:00 on BBC Radio 4 FMAvailable for over a yearListen nowHow Roosevelt was warned of Germany's nuclear threat by two Hungarian refugees from Long Island in 1939, thanks to a boy who liked fishing.GenresFactualArts, Culture & the MediaBrandLetter from America by Alistair Cooke Source: BBC Online