Analog Science Fiction - Science Fact July 1987 (Vol.107, No.7)
Cover by Dell Harris (for "The Changeling Hunt.")

Serial: "The Report on Bilbeis IV" (conclusion) by Harry Turtledove (formed part of Noninterference.)

Novelettes: "The Changeling Hunt" by Robert R. Chase
"Trader's Partner" by Charles Sheffield ("Trader's" series)

Science Fact: "Moonbase Orientation Manual II: Research and Recreation" by Ben Bova.

Stories "The President's Doll" by Timothy Zahn
"All the People, All the Time" by W. T. Quick.

Probability Zero: "Left to Right, and Beyond" by Harrison Roth & Isaac Asimov.

Stanley Schmidt's editorial is "The Reactionary Revolution"