The complete film can be found at: http://www.archive.org/details/why_not_live
The entire film can be downloaded at: http://www.archive.org/details/hindenberg_explodes
From a Depression-era documentary that describes the importance of the Mississippi River. Written and directed by Pare Lorentz The complete film can be found at: http://www.archive.org/details/RiverThe1937
The entire film, "Coney Island", can be downloaded at: http://www.archive.org/details/ConeyIsl1940
I left the original soundtrack on the clip because it contains a lot of information you can probably use.
Excerpt From "The Arizona Kid": http://www.archive.org/details/arizona_kid