<Tr> <Td_colspan="2"> Presentation by Ken Burns and Dayton Duncan on The National Parks at the National Book Festival, September 26, 2009, C - SPAN </Td> </Tr> <Tr> <Td_colspan="2"> Interview with Ken Burns and Dayton Duncan on The National Parks at the National Book Festival, September 26, 2009, C - SPAN </Td> </Tr> <P> The film was previewed in a seven - minute segment at the end of the fourth episode of Burns's 2007 PBS documentary, The War . The first two - hour segment premiered at the Hopkins Center for the Arts at Dartmouth College on April 17, 2009 . Episodes debuted daily, beginning Sunday September 27 to Friday October 2, with full episodes online the following day . </P>

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