Astounding Science Fiction July 1956 (Volume 57, Number 5)
Illustrations by Ed Emshwiller, Kelly Freas, H. R. van Dongen. Cover by H. R. van Dongen (for "Critical Difference.")

Novelettes: "Critical Difference" by Murray Leinster (incorporated into fix-up Colonial Survey, a.k.a. The Planet Explorer.)
"Machine Complex" by Randall Garrett
"A Little Thing for the House" by F. L. Wallace.

Stories: "Wild Modesty" by Allen Lang
"Tomb Tapper" by James Blish.

Article: "Island in the Sky" by Robert S. Richardson.

John W. Campbell's editorial is "Thought Without Words"; Book reviews by P. Schuyler Miller.