OETA has an excellent series call American Experience that delves into American history and this is the episode about the dustbowl days of the 30's
http://www.pbs.org/wgbh/americanexperience/films/dustbowl/player/
It is most excellent viewing.
http://www.pbs.org/wgbh/americanexperience/films/dustbowl/player/
It is most excellent viewing.