Illustration by J. Allen St. John for "Perils of Dragonia." This story by Mollie Claire appeared in the April 1949 issue of Fantastic Adventures. The giant horse has wheels on his feet.
Tarzan of the Air Promo Book, 1934. Art by J. Allen St. John.
Tarzan drawing by Joe Kubert, 1971.
Tarzan at the Earth's Core by Edgar Rice Burroughs. Cover art by Frank Frazetta. I love the saber tooth tiger flying through the air in the upper right.