Call of Cthulhu RPG is a 47-book series with 47 released primary works first released in 1981 with contributions by Keith Herber, William Deitze, Sandy Petersen, Lynn Willis, Chris Williams, Richard Watts, Mark Morrison, Kevin Ross, Scott David Aniolowski, Fred Behrendt, J. Todd Kingrea, Mike Szymanski, Sam Johnson, Sandy Antunes, Owen Guthrie, Chaosium Inc., Dennis Detwiller, Adam Scott Glancy, John Tynes, John H. Crowe III, Michael Cisco, Denis Detwiller, Jeff Moeller, Rebecca Strong, Shane Ivey, Charles Engan, Jan Engan, Bruce Ballon, Matt Harpold, Paul Carrick, Monte Cook, Tim Wiseman, Jason Williams, Jason Williams, Alan Bligh, Keary Birch, Paul Fricker, Mike Mason, John French, Warren Banks, Greg Stolze, Kenneth Hite, Sarah Newton, Bret Kramer, Anthony Warren, pookie, Sam Zeitlin, Dave Sokolowski, Dave Blewer, Alex Bund, Adam Crossingham, Mathew Pook, Caleb Cleveland, Lee Simpson, Lynne Hardy, Bill Bodden, Gavin Inglis, Jeffrey Moeller, Stephanie McAlea, Scott Dorward, Simon Brake, Brian M. Sammons, Oscar Rios, Greg Stolze , Dennis Detwiller, Allan Gooda ll, Shane Ivey, Dave Blewer,, Yurek Chodak, Tadashi Ehara, Harry Henderson, Charlie Krank, Steve Perrin, Greg Stafford, Anders Swenson, Inc Staff Chaosium, Jesse Hawkins, Joshua O'Connor, Reuben Saunders, Chad Bowser, Ilya Sadchikov, Chris Birch, Yuri Kalugin, Sergey Kataev, and Benjamin Wenham.