Artists who do propaganda posters, 50's art?

For A2 art I need to collect some artists who did sort of propaganda artwork, "Britons needs you" etc etc.

I am looking for that type of retro 50's look like you get on those spoof posters, with things like this;

http://img2.allposters.com/images/adc/10204354A.jp...

Also, the kind of thing Fallout 3 spoofs would be good to have. I need both artists and pictures though, so feel free to provide either.

Thanks in advance.