Isaac Asimov's Science Fiction Magazine: September 28, 1981.
Volume 5, Number 10 (whole #44.) Cover: George Angelini.

Featured stories:
"SF on the Dial" by Alan Lankin (article)
"The Dark Companion" by John M. Ford
"Ask Penny Jupiter" by Ron Goulart
"On the Continuing Adventure: The Fourth Sally" (article) by John M. Ford
"If Continents Can Wander, Why Not Planets?" (article) by Robert Schadewalde
"You Can’t Go Back" by R. A. Lafferty
"Reliquary for an Old Soul" by Sharon Webb
"Limits" by Larry Niven
"Lirios: A Tale of the Quintana Roo" by James Tiptree, Jr. (novelette.)