1966–1971[]
Black and white (1966)
Color version (1966–1971)
Alternate color title (1968)
1971–1983[]
1971
1971
1979
1983–1989[]
1989–1991[]
1991–1995[]
1995–1999[]
2018–present[]
In 2018, the program was rebooted after an eighteen-year absence. The show premiered on PBS June 2, 2018, hosted by Margaret Hoover.
