Matt Harpold
Matt Harpold's most popular book is Unseen Masters: Modern Struggles Against Hidden Powers with 1 save and an average rating of -.
Authorship percentage indicates primary author status - excluding introductions, forewards and other contributions.
Series
1 primary book49 released booksAuthored 2% of series
Call of Cthulhu RPG
Call of Cthulhu RPG is a 49-book series with 49 released primary work first released in 1981 with contributions by Keith Herber, William Deitze, and Sandy Petersen.
