Dragonseye by Anne McCaffrey

When the volcanoes rumble and the powerful storms begin brewing on Pern, it means one thing: Thread. For 257 years Pern has been free of the life-destroying Thread, but now the Red Star has reappeared in the sky and soon the deadly Threadfall will follow. In the holds and weyrs across the land, the genetically-engineered dragons of Pern and their human riders begin feverishly training to combat the Thread, for only dragon fire can destroy the silvery invaders. But, incredibly, one Lord Holder refuses to believe the Thread will fall again, and he may endanger the entire planet.

Dragonsdawn by Anne McCaffrey

Readers who for two decades have been following the fortunes of the dragonriders and other inhabitants of the planet Pern will welcome the latest volume, chronicling the early years. It stands very much on its own, however; knowing about the later history of the planet only adds enjoyment. After 15 years of cold sleep, 6000 colonists land on Pern, seeking a simpler existence, escaping the aftermath of interstellar war and an overly technical society. The colony prospers until the consuming Threada force that destroys all life it comes in contact withmakes its first appearance.

Dragondrums by Anne McCaffrey

In the world of Pern, Harpers with great musical ability are held in extreme regard. This is why the young, mischievous Piemur carries himself with so much pride, for he sings like an angel. But when his voice begins to change, Piemur loses all confidence and questions his role within Harper Hall.

Dinosaur Planet Survivors by Anne McCaffrey

Kai and Varian awoke from their forty years of coldsleep only to discover that mutineers had taken over Ireta. But they were determined to save their planet and its unusual dinosaurs. All they had to do was solve the planet's myriad mysteries and gain the trust of the most dangerous beings in their Universe....

Dinosaur Planet by Anne McCaffrey

On Earth they had died out 70 million years ago. But on Ireta they ruled in all their bizarre splendour. The Dinosaurs. Relics from a forgotten age, they roamed a planet as mystifying as any in the galaxy. And the expedition sent to explore it was trapped within its toils as quickly and mysteriously as their relief ship disappeared. And worse. For the Heavyworlders, half the expedition's personnel, reverted to type, and as predatory carnivores systematically hunted down their colleagues. Only the frozen sleep of cryogenics offered an escape. But for how long?