Amazon.com Product Description (ISBN 009948773X, Paperback)

Rip-roaring adventures in a stunning new two-in-one package.

In Amazon Adventure, Hal and Roger Hunt take a pioneering expedition with their father into the uncharted waters of the Pastaza River, deep in the Amazonian jungle. They’re looking for animals for their father’s collection, but it seems someone doesn’t want them to . . .

In Diving Adventure, Hal and Roger are in search of the marine wildlife that lives around Undersea City in the tropical waters of the Great Barrier Reef. They have some close encounters with sharks and killer whales but when the boys discover hidden gold in a sunken ship and their old enemy, Kaggs, appears, things start becoming even more dangerous . . .