The plans relate to Britain's first operational nuclear bomb, the 15 kilotonne Blue Danube, which was in service with the Royal Air Force's B-bomber fleet from 1953 to 1961. A Ministry of Defence ...

Subject: the Blue Danubian States. This year the small countries through which mighty Mother Danube (yellow in color) flows 1,725 miles from the Alps to the Black Sea are desperately blue.