

I enjoyed this adventure story that I picked up free LAST summer from audiosync... https://www.audiobooksync.com/ they give out free YA and classic audiobooks during the summer months if you have not discovered them already.
Just be forwarned that it is a product of its time, there are big game hunters, ape-men, Indians, negros, half-breeds etc on this adventure romp through the amazon in to the lost world of Pterodactyls, Stegosauruses, etc