Dragonsdawn
The Chronicles of Pern: First Fall
Second Pass:
Dragonseye
Third Pass:
Dragon's Kin
Dragonsblood
Sixth Pass:
Moreta: Dragonlady of Pern
Nerilka's Story
Ninth Pass:
Dragonflight
Dragonsong
Dragonquest
Dragonsinger (overlaps with Dragonquest)
The White Dragon
Dragondrums (overlaps with The White Dragon)
Masterharper of Pern (overlaps with most of the others)
Renegades of Pern
The Girl Who Heard Dragons (short story)
All the Weyrs of Pern
The Dolphins of Pern
The Skies of Pern
Others:
A Gift of Dragons
The Girl Who Heard Dragons (includes of the short
story also called the same)