Astounding Science Fiction June 1950 (Volume 45, Number 4)
Illustrations by Miller, Orban, and Hubert Rogers. Cover by Miller (for "Incommunicado.")

Novelettes: "Incommunicado" by Katherine MacLean
"The Evitable Conflict" by Isaac Asimov ("Susan Calvin"/Robots series)

Stories: "Punching Pillows" by Cleve Cartmill
"The Maze" by Frank M. Robinson

Article: "The Mayan Elephants" by L. Sprague de Camp.

Serial: "The Wizard of Linn" (conclusion) by A. E. van Vogt

John W. Campbell's editorial is "Education."