Long Island teenagers Hal and Roger Hunt explore uncharted Amazon River with their father, expert naturalist John Hunt for his exotic animal collection. Someone sends an anonymous telegram, so John returns. Alone, the boys face hostile natives, dangerous rapids and wild animals, and a hunchback with bloodshot eyes.

Willard Price, South Sea Adventure, hardcover, 1952

Once again Hal and Roger Hunt are on board the Lively Lady, studying submarine life and searching for the treasure of Santa Cruz which sunk three whole centuries ago! But Skink - an unscrupulous former school friend of Hal's, is also on board and he will stop at nothing to get the treasure for himself. . .

One of a series of adventure stories featuring Hal and Roger Hunt. The boys are helping Dr Dan Adams to research volcanoes in the Pacific. When Mount Myojin erupts, the doctor's strange behaviour endangers them all as they flee an eruption big enough to devastate a city the size of New York.

On the high seas, hardships and horrors fill old-fashioned whaling techniques.

A reissue of Willard Price's classic adventure series set in the animal kingdom. Hal and Roger Hunt are on the trail of a vicious man-eating leopard. Yet they are also being hunted themselves, by a merciless band of killers known as the Leopard Society. Can they trust their own tracker, Joro, despite knowing that he has pledged to lead them to their deaths?

Elephant Adventure (Knight Books) Price, Willard and Marriott, Pat

Hal 19 and Roger Hunt 13 bring 30 natives to join warden Mark Crosby in Tsavo, Kenya, Africa, where poaching is big business. He has lost 12 of 22 rangers to a gang leaving a blood-stained trail of terror and torture. The teens need to find the mysterious leader Blackbeard, before they too become victims.

Hal and Roger Hunt have been sent out on a terrifying mission - they must save the population of Mtito Andei from a man-eating lion. But the 'King of the Beasts' isn't the only thing trying to kill the boys..........Have the brothers bitten off more than they can chew this time?

'You stand rooted to the spot or you run like mad.' Hal and Roget Hunt head off for another challenging mission—this time to search for gorillas in the Congo jungle. But when the boys stumble across the evil trade in baby gorillas, someone seems determined to silence them once and for all.

Teens Hal and Roger Hunt stay in Undersea City, 200' below Australia's Great Barrier Reef, to find rare species for dad's Long Island collection, and ways to produce food from sea. They face coral cuts, man-eating sharks, killer whales, giant squid, other dangers. When they find sunken treasure, villain Kaggs starts a landslide, proves deadlier than sea creatures.

Hal and Roger Hunt explore a wild and dangerous island, Papua New Guinea. They tackle man-eating crocodiles, cannibals, and even a dragon. Their old enemy Kaggs wants revenge.

A reissue of Willard Price's classic adventure series set in the animal kingdom. Hal and Roger Hunt are in India, investigating rare and dangerous animals for their father. But on the trail of the rare white tiger, high in the Himalayas, disaster strikes and the brothers realise they are walking into the jaws of death.

Hal and Roger Hunt are colder than they've ever been in their lives, up among the ice floes of Greenland. This harsh land holds many dangers, from killer whales to grizzly bears, but an evil man may turn out to be the deadliest threat the boys have to face.