Series
The Dragonriders of Pern series has 3 books.
Published between 1968 and 1978, in the same order they are meant to be read.
On the world of Pern, dragons and their riders are the only defense against deadly Thread falling from the sky. Lessa, a dispossessed noblewoman disguised as a drudge, discovers her destiny as a dragonrider and must save her world from an ancient threat. McCaffrey blends science fiction and fantasy
All 3 books total 1,174 pages.
The Books Oracle — track the series you are partway through, and see what to read next.