|Examples of the diverse WWI poster collection assembled by Colonel Edward H. McCrahon. Image courtesy of Guernsey's.|
|One of McCrahon's WWI bond|
posters. Image courtesy of
Guernsey's Auction House.
|An example of a WWI French language poster printed in|
the United States. Image courtesy of Guernsey's Auction
I found a really interesting website with information about WWI & II artists who produced posters like these as well as images of combat as many of them also served in the military:
World War Pictures: Posters, Photos, Poets and Artists