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Michael Landon (1936 - 1991) is an actor best remembered for his roles on Little House on the Prairie, Bonanza, and Highway to Heaven.
In 1970, Landon appeared in an insert with Bonanza co-stars Lorne Greene and Dan Blocker on Sesame Street episode 0131, counting to twenty.
They also appeared in episode 0171, saying the alphabet, and in episode 0184, subtracting horses.