RECOMMENDATION

By all means, go to Rockwell's web site. Full of great stuff. He did 321 covers for Post, alone, and was "with them" (contract?) for 47 years. (Averaged 7 per year, theoretically.) Looks like a lot of stamps were also printed. I guessed correctly, as Post's circulation jumped by many thousands whenever his cover appeared. If his work is new to you, click on his "Four Freedoms," which were extremely famous during WWII.