The White Dragon
Dragonriders of Pern #3
a young holder lord impresses a runt dragon. The southern continent is shown to be HUGE and the northerners want it opened up for their landless children. F’lar wants the best of the continent for dragonmen so they won’t be beholden to the holds once threadfall passes. Everything works out and it is discovered that man is not indigenous to Pern.
This was a good wrap up to the original trilogy, BUT, McCaffrey rushes forward so quickly that you can see the world going from Dragons and Fantasy to Science Fiction. and I think that is why her later books are weaker.