Wednesday, October 23
SUMMER OLYMPICS (ABC, 1-2 p.m., 7-7:30 p.m., 10-11 p.m.).* Continuation of ABC's 44-hour telecast of the 1968 Summer Olympic games live from Mexico City. Ends Sunday.
AMERICAN WONDERLANDS&151;THE NATIONAL PARKS (CBS, 7:30-8:30 p.m.). A National Geographic Society special on the beauty of the U.S. parks system.
GIRL FRIENDS AND NABORS (CBS, 8-9 p.m.). Jim Nabors hosts Debbie Reynolds, Vikki Carr, Carol Burnett and Metropolitan Opera Soprano Mary Costa in a variety of tunes ranging from Row, Row, Row Your Boat to the waltz from Gounod's Roméo et Juliette.