Sandy Petersen's Cthulhu Mythos (for Pathfinder 2e)Sandy Petersen · First published 2021Open the Tome
S. Petersen's Field Guide to Lovecraftian HorrorsSandy Petersen, Lynn Willis, Mike Mason · First published 2016Open the Tome
Call of Cthulhu Rpg Keeper RulebookSandy Petersen, Lynn Willis, Mike Mason · First published 2016Open the Tome
Infant and Toddler Development and Responsive Program PlanningDonna S. Wittmer, Sandy Petersen · First published 2005 · Latest edition 2013Open the Tome
H.P. Lovecraft's Dreamlands, 2nd edition (Call of Cthulhu: Roleplaying Beyond the Wall of Sleep)Sandy Petersen · First published 1988Open the Tome
