Charles Schneeman - Illustrations for A. E. van Vogt's "CO-OPERATE — OR ELSE!"
Riding Through the Jungle
Encounter with the Rull
Descent to Eristan II
Artwork originally appeared in Astounding Science Fiction (April 1942). More on the source of these illustrations later this weekend.
If you squint at the top one with the guy riding the beast it almost passes for a panel from some fantastic unmade Charles Burns comic.