Michael S. Shiffer
Michael S. Shiffer has written at least 1 book. Their most popular book is GURPS Alternate Earths: Parallel Histories for the Infinite Worlds with 2 saves with an average rating of 3⭐.
Michael S. Shiffer has written at least 1 book. Their most popular book is GURPS Alternate Earths: Parallel Histories for the Infinite Worlds with 2 saves with an average rating of 3⭐.
