 The next listing for "Blackhawk" should have been January 3, 1951.However, in its time slot appeared "Big Jon and Sparky", which held that time slot Monday-Friday throughout January, when I stopped looking.Checking on Monday, January 1, and Tuesday, January 2, "Space Patrol" and "Superman" had their final listings in that time slot rotation, which began Monday, September 11, 1950 on WJZ."