Self - Narrator (6 episodes, 2009)
Self - Historian (6 episodes, 2009)
Self - Writer (6 episodes, 2009)
Self - Park Ranger (6 episodes, 2009)
Self - Writer (5 episodes, 2009)
Self - Sierra Club (5 episodes, 2009)
Reader (5 episodes, 2009)
Self - Writer (4 episodes, 2009)
Reader (4 episodes, 2009)
Reader / Self - Muir Historian (4 episodes, 2009)
Self - Historian (3 episodes, 2009)
Self - Former Ranger (3 episodes, 2009)
Self - Journalist (3 episodes, 2009)
Self - Park Superintendent (3 episodes, 2009)
Reader (3 episodes, 2009)
Self - Historian (2 episodes, 2009)
Self - Former Park Service Director (2 episodes, 2009)
Self - Writer (2 episodes, 2009)
Self - Daughter of Horace Albright (2 episodes, 2009)
Self - Former Ranger (2 episodes, 2009)
Self - Former Interior Secretary (2 episodes, 2009)
Self - Former Park Superintendent (2 episodes, 2009)
Himsel - Nephew of Adolph Murie / Self - Writer (2 episodes, 2009)
Reader (2 episodes, 2009)
Self - Writer (1 episode, 2009)
Self - Alaskan Bush Pilot (1 episode, 2009)
Self - Historian (1 episode, 2009)
Self - Son of Harold Bradley (1 episode, 2009)
Self - Explorer (1 episode, 2009)
Self - Photographer (1 episode, 2009)
Self - Resident of Redford, Texas (1 episode, 2009)
Self - Resident of Brooklyn, New York (1 episode, 2009)
Self - Resident of Blossom, Texas (1 episode, 2009)
Reader (1 episode, 2009)
Self - Daughter of George Melendez Wright (1 episode, 2009)
Self - Former Park Superintendent (1 episode, 2009)
Self - Granddaughter of Chiura Obata (1 episode, 2009)
Self - Former Governor & Senator, Wyoming (1 episode, 2009)
Self - Seward Resident (1 episode, 2009)
Self - Park Superintendent (1 episode, 2009)
Chiura Obata (1 episode, 2009)