Chaosium's Call of Cthulhu books

Chaosium's Call of Cthulhu books is a 21-book series with 21 released primary works first released in 1976 with contributions by Brian Lumley, Fritz Leiber, A.A. Attanasio, Robert Bloch, James Wade, Bob Van Laerhoven, Ramsey Campbell, Walter C. DeBill Jr., Joseph Payne Brennan, Lin Carter, Eddy C. Bertin, Ambrose Bierce, Robert M. Price, H. P. Lovecraft, Daniel Harms, Henry Kuttner, Lord Dunsany, M.R. James, August Derleth, Alan Dean Foster, C.J. Henderson, David C. Smith, Leonard Carpenter, Will Murray, Donald R. Burleson, Steven Paulsen, Pierre Comtois, Robert Silverberg, John Brunner, Robert A.W. Lowndes, Richard L. Tierney, Fred Chappell, L. Sprague de Camp, Frank Belknap Long, Fred L. Pelton, D.R. Smith, David T. St. Albans, Frederik Pohl, Manly Wade Wellman, Martin D. Brown, Henry Dockweiller, Arthur C. Clarke, Roger Johnson, Edgar Allan Poe, John Taine, John Glasby, John W. Campbell Jr., Robert E. Howard, and Arthur Machen.