Sandy Petersen's Cthulhu Mythos

2023

RuneQuest

2019

Call of Cthulhu Sverige

Utredarens handbok

2019

Petersen's Abominations

Five Epic Tales of Modern Horror

2018

Call of the Cthulhu

Guardian Rulebook

2016

The Derelict

A Tale of Terror for Call of Cthulhu

2016

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

Call of Cthulhu

Horror Roleplaying

2016

Call of Cthulhu Keeper Screen

2015

Guide to Glorantha Volume 1

2014

Quick Start Cthulhu

2004

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 Cthulhu Monsters

A Field Observer's Handbook of Preternatural Entities

1988

Miskatonic U. Graduate Kit

Artifacts from the World's Scariest University

1987

Fragments of Fear

The Second Cthulhu Companion

1985

Stormbringer Companion

1983

The Asylum and Other Tales

1983