The By the People, For the People: Posters from the WPA, 1936-1943 collection consists of 908 boldly colored and graphically diverse original posters produced from 1936 to 1943 as part of Franklin Delano Roosevelt’s New Deal.
Not only are the posters fabulous, beautiful and most every other adjective bestowed to vintage prints, but the Libary of Congress offers uncompressed tiff versions of the prints — some as large as 32 megs!
Be sure to browse by subject so you can view all of the posters.
Library of congress is wonderful… And, for the most part it seems, the prints all fall under fair-use copyrights. Nifty!