2 books in series

The Book of Cthulhu

The Book of Cthulhu is a 2-book series with 2 released primary works first released in 2011 with contributions by Laird Barron, Molly Tanzer, Elizabeth Bear, Sarah Monette, John R. Fultz, Paul Tobin, William Browning Spencer, Kim Newman, Christopher Reynaga, Gord Sellar, Michael Chabon, Mark Samuels, Matt Wallace, Stanley C. Sargent, Orrin Grey, Karl Edward Wagner, Neil Gaiman, Cody Goodfellow, Caitlín R. Kiernan, Fritz Leiber, Livia Llewellyn, W.H. Pugmire, Ann K. Schwader, Adam Scott Glancy, and Jonathan Wood.

The Book of Cthulhu
The Book of Cthulhu II