The Magazine of Fantasy & Science Fiction: June 1983 (Volume 64, Number 6)
Cover by Michael Garland (for "Slow Birds.")

Novelets: "Slow Birds" by Ian Watson (Hugo & Nebula nominee)
"Down Among the Dead Men" by Gardner Dozois & Jack Dann
"Grimes and the Odd Gods" by A. Bertram Chandler (a "John Grimes/Rim" story.)

Stories: "The Frog He Would A-Wooing Go" by Reginald Bretnor
"A Single Yesterday" by B. L. Keller
"The New Prehistory" by Rene Rebetez
"From the Desk of Gilmer C. Merton" by Gene Wolfe
"Cenotaph" by Richard Mueller
"The Cruelest Month" by James Patrick Kelly.

Science: "The Properties of Chaos" by Isaac Asimov.