Amanda Salb , a junior at Mt. Holyoke College in South Hadley, Mass. , won a national championship in track and field Friday night. She won the national title in NCAA Division III in the national championships held at MacAlester College in St. Paul, Minn. , in the shot put with a distance of 44 feet 11 inches. Not only is the distance her best personal record, but it's the best ever at Mt. Holyoke and the best this year in Division III for women. picayune-times