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1993 intro and funding credits for the show's 20th anniversary
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1992-1993 intro (Version #1)
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1992-1993 intro (Version #2)
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This is the very first intro from 1974-1975
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1975-1976 intro
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1976-1981 intro
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1999-2000 intro and funding credits
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1986-1987 intro and funding credits
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1989-1991 intro
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1996 intro and funding credits from "Bombing of America"
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Opening to "A Man, A Plan, A Canal: Panama" from 1999
