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1969 • 13 Episodes
Season 1 of Hadleigh premiered on September 16, 1969
1971 • 13 Episodes
Season 2 of Hadleigh premiered on January 8, 1971
1973 • 13 Episodes
Season 3 of Hadleigh premiered on June 22, 1973
1976 • 13 Episodes
Season 4 of Hadleigh premiered on March 5, 1976