According to this interesting item, the artist of this auction-found poster is Robert McCall.
But who are the space artists who produced these two images of the Boeing X-20 Dyna-Soar?
Space Exploration Stack Exchange is a question and answer site for spacecraft operators, scientists, engineers, and enthusiasts. It only takes a minute to sign up.Sign up to join this community
First image is apparently by Robert McCall
Second is Frederick E Fahdt (also, better image quality)
I've got nothing on the third one.