Two ways you can do this via the internet... one is go to ART.COM and search for VINTAGE POSTERS - then sub-select RUSSIAN.
OR
You can go to
www.google.com and in the search criteria put in the words "Russian propaganda" + "WWII"
This will show you a bunch of possible links. Click on the IMAGES tab and you can visually see the pictures. Copy / paste the ones you like into PC Paint (or similar program) and size them as needed. Then print them on thick glossy paper and you are all set.
Once you have cut them out an mounted them, hit the image with a flat spray to seal the image ink, and to eliminate the glossy appearance.
Works great... I do this frequently!