All authors
Sandy Petersen
Books21
with Mike Mason
with Mike Mason, Richard Watts, Mark Morrison, Geoff Gillan and Lynne Hardy
with Greg Stafford, Jeff Richard and Michael O'Brien
with Lin Willis

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
with Lynn Willis
with Mike Mason
with Greg Stafford
with Greg Stafford
with Lynn Willis
with Greg Stafford

S. Petersen's Field Guide to Creatures of the Dreamlands: An Album of Entities from the Land Beyond the Wall of Sleep
1989
with Lynn Willis
with Greg Stafford and Lynn Willis
with Bob Charette
with Chris Williams
with Greg Stafford
with Lynn Willis




















