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 and 38 others.