Fragments of Fear

The Second Cthulhu Companion

1985

Call of the Cthulhu

Guardian Rulebook

2016

Call of Cthulhu Keeper Screen

2015

Petersen's Abominations

Five Epic Tales of Modern Horror

2018

Guide to Glorantha Volume 1

2014

The Asylum and Other Tales

1983

S. Petersen's Field Guide to Cthulhu Monsters

A Field Observer's Handbook of Preternatural Entities

1988

Stormbringer Companion

1983

Call of Cthulhu

Horror Roleplaying

2016

RuneQuest

2019

Sandy Petersen's Cthulhu Mythos

2023

S. Petersen's Field Guide to Creatures of the Dreamlands

An Album of Entities from the Land Beyond the Wall of Sleep

1989

S. Petersen's Field Guide to Lovecraftian Horrors

A Field Observer's Handbook of Preternatural Entities and Beings from Beyond the Wall of Sleep

2016