The Magazine of Fantasy and Science Fiction: October 1966 (Volume 31, Number 4)
Cover by Ed Emshwiller (yes, that is a portrait of Isaac Asimov - before he got the sideburns.)
Special Isaac Asimov Issue

Novelette: "The Key" by Isaac Asimov (a "Wendell Urth" story)
Appreciation: "You Can't Beat Brains" by L. Sprague de Camp.
Bibliography: "Isaac Asimov: A Biblography" (by Isaac Asimov??)
Science: "Portrait of the Writer as a Boy" by Isaac Asimov
Verse: "The Prime of Life" by Isaac Asimov
Cartoon: Gahan Wilson.

Stories: "The Mirror" by Arthur Porges
"Come Back Elena" by Vic Chapman
"Something In It" by Robert Louis Stevenson
"Burning Question" by Brian W. Aldiss.
Novelettes: "The Picture Window" by Jon DeCles
"An Extraordinary Child" by Sally Daniel.

Edward L. Ferman is Editor, Ted White is assistant Editor, Robert P. Mills is Consulting Editor.