Advanced Dungeons & Dragons, 2nd Edition is a 24-book series with 23 released primary works first released in 1989 with contributions by David Zeb Cook, Dale Henson, Aaron Allston, Rick Swan, Jeff Grubb, John Nephew, Grant Boucher, Arthur Collins, Troy Christensen, Steve Winter, Ed Greenwood, William W. Connors, Bill Slavicsek, Anthony Herring, Julia Martin, Steven Schend, J. Robert King, Tim Beach, Karen Boomgarden, Walter M. Baas, Skip Williams, Bruce Nesmith, Wolfgang Baur, Lester W. Smith, John Terra, Steve Kurtz, TSR Inc. Staff, Richard Baker, Steve Miller, and Wizards of the Coast.