The Magazine of Fantasy and Science Fiction: May 1969 (Volume 36, Number 5)
Cover by Jack Gaughan (for "Operation Changeling.")

Serial: "Operation Changeling" (Part 1 of 2) by Poul Anderson (part of Fix-up novel Operation Chaos.)
Novelet: "For the Sake of Grace" by Suzette Haden Elgin (formed beginning of At the Seventh Level.)

Stories: "The Beast of Mouryessa" by William C. Abeel
"London Melancholy" by M. John Harrison
"Copstate" by Ron Goulart
"The Flower Kid Cashes In" by George Malko.

Science: "The Power of Progression" by Isaac Asimov.