WPA Posters
Apartment Therapy has a great post on vintage WPA posters created during the 1930s and ’40s. The posters are part of the By the People, For the People: Posters from the WPA collection which you can view online. You can also order posters in various sizes for your own collection of classic American design.
By the People, For the People: Posters from the WPA (via Apartment Therapy)
Apartment Therapy post (with instructions on ordering prints)