Books with author douglas hill

An alien planet - and an evil trade . . . EXTRA - an organization devoted to trade and exploration missions to alien planets. Thirteen-year-old Jonmac is part of the group who set up a base on the distant planet of Bregele II, home to...THE STIKS - tall, spindly humanoids whose peaceful natures and primitive ways make them easy prey for...THE DUSTERS - a group of vicious, ruthless criminals who offer the Stiks a dangerously addictive drug in return for their valuables.As tension and fear spiral into an explosive and violent confrontation, Jonmac is plunged into a sudden, horrifying danger - and a terrible isolation. His only chance of survival is to win the trust of the Stiks...

Death in a deep canyon! If the river don't get you, the savages will...Kit Carson is in for the ride of his life when he finds himself trapped on a flimsy raft hurtling down the roaring Green River, straight into a mysterious canyon surrounded by impossible sheer rock walls. Kit's first worry is finding a way out--until he comes face-to-face with a primitive tribe of Indians.