March 17 - Following are the top 10 movies at North American box offices for the three-day weekend starting March 15, led by "Oz the Great and Powerful" at No. 1, according to studio estimates compiled by Reuters. 1 (1) Oz the Great and Powerful...........$42.2 million 2 (*) The Call............................$17.1 million 3 (*) The Incredible Burt Wonderstone.....$10.3 million 4 (2) Jack the Giant Slayer...............$ 6.2 million 5 (3) Identity Thief......................$