UFO

UFO is a 6-book series with 6 primary works first released in 1970 with contributions by Sergei Lukyanenko, Lavie Tidhar, Jennifer Pelland, Stephanie Burgis, Jake Kerr, Alex Shvartsman, Jody Lynn Nye, Mike Resnick, Nathaniel Lee, Ken Liu, Robert Silverberg, Esther Frisner, Jim C. Hines, Tim Pratt, Piers Anthony, Karen Haber, Gini Koch, Kevin J. Anderson, David Gerrold, Esther M. Friesner, Bill Ferris, James Wesley Rogers, Laura Resnick, Zach Shephard, Shaenon K. Garrity, Caroline M. Yoachim, Nathan Hillstrom, Mitchell Shanklin, Daniel J. Davis, Paul R. Hardy, Shane Halbach, Fred Stesney, Cat Rambo, Sarah Pinsker, Lawrence M. Schoen, and Shaenon Garrity.