That shot was taken by Jack Delano, a Farm Security Administration photographer. His work is really awesome.
Let me direct you all to a site I visit every day that has a lot of his images and plenty of other great ones as well, from the civil war up to the 1960s. http://www.shorpy.com
I got the information from an article I once read in a British Journal of Photography special issueto celebrate the fiftieth aniversary of Kodachrome, twenty odd years ago, and it's always stuck in my mind.
I just tried to bring up the link to the photographs, it came back with the message; "URL not found." I do admit that this was posted six (6) days ago, but I did not realize that things moved that quickly in the computer and internet world.