Escape on Venus Author:Edgar Rice Burroughs Carson Napier, Earth's first astronaut, found more trouble than he'd bargained for when he helped Duare, princess of Vepaja, escape her captors on the unmapped, cloud-shrouded planet of Venus. They found Mypos, the country of the amphibians; they found the Brokols, whose young grow on trees; and they found Voo-ad, the city of the human amoebae. ... more »The story of their adventures and their frantic attempts at survival make up the thrilling yarn that could only be put on paper by the world famous author of the Tarzan tales.« less
Another "un-putdownable" entry in the Venus series. Dray Prescot remains my favorite "planetary romance", but Burroughs books like this make it a tough call!