Martin Harry Greenberg

Alternate Generals II

Year unknown Harry Turtledove, Martin Harry Greenberg, and Martin H. Greenberg

Dark Love

Year unknown Nancy A. Collins, Edward E. Kramer, Martin H. Greenberg, Stephen King, Michael O'Donoghue, Kathe Koja, Basil Cooper, John Lutz, David J. Schow, Robert Weinberg, Ramsey Campbell, Stuart M. Kaminsky, Wendy Webb, Richard Laymon, Bob Burden, George Chesbro, John Peyton Cooke, Kathryn Ptacek, John Shirley, Michael Blumlein, Edward Gorman, Lucy Taylor, Karl Edward Wagner, Douglas E. Winter, and Martin Harry Greenberg

Ray Bradbury

Year unknown Martin Harry Greenberg, Joseph D. Olander, and Martin H. Greenberg

Robert A. Heinlein

Robert A. Heinlein

Year unknown Joseph D. Olander, Martin Harry Greenberg, and Martin H. Greenberg

Spaceships & spells

Year unknown Jane Yolen, Martin H. Greenberg, Charles Waugh, Isaac Asimov, and Martin Harry Greenberg

Ursula Le Guin

Ursula Le Guin

Year unknown Joseph D. Olander, Martin Harry Greenberg, and Martin H. Greenberg