THE NATIONAL PARKS: AMERICA'S BEST IDEA

This afternoon, I caught parts of episodes 3, 4, and 5 of  "THE NATIONAL PARKS: AMERICA'S BEST IDEA", a PBS special airing since September.  The Ken Burns documentary did an excellent job of demonstrating the importance of photographers in the early years of the national park system.   Due to the difficulty of travel in those days, photographers were able to produce "coffee table" style books for passing around in Washington, DC and among constituencies for demonstrating the value of setting aside pristine wilderness.  Without the photographs, the wilderness would have been more abstract in concept.  Chief among the photographers was Ansel Adams, who travelled to and photographed every national park in America during an 8 year period, except one.  He regretted that he never made it to the Everglades.
Here is a link to the PBS site...  http://www.pbs.org/nationalparks/
I think you can view episodes online through that site.