Invasions
Year unknown
Isaac Asimov, Martin H. Greenberg, Charles G. Waugh, A. E. van Vogt, Eric Frank Russell, Bob Shaw, Mark Clifton, Philip K. Dick, Walter M. Miller Jr., Lester del Rey, Avram Davidson, Piers Anthony, Philip E. High, William Tenn, Albert Flynn, Fred Saberhagen, and Henry Kuttner
