Introduction (First Step Outward) • essay by Poul Anderson
Prologue (First Step Outward) • essay by Robert Hoskins
Cold War • (1949) • short story by Kris Neville
Third Stage • (1962) • short story by Poul Anderson
Gentlemen, Be Seated! • (1948) • short story by Robert A. Heinlein
Jaywalker • (1950) • short story by Ross Rocklynne
The Hated • (1958) • short story by Frederik Pohl
Sunrise on Mercury • (1957) • short story by Robert Silverberg
Hop-Friend • (1962) • short story by Terry Carr
The Man Who Lost the Sea • (1959) • short story by Theodore Sturgeon
First Contact • (1945) • novelette by Murray Leinster
Misbegotten Missionary (aka Green Patches) • (1950) • short story by Isaac Asimov
Market in Aliens • (1968) • short story by K.M. O'Donnell ]
The Rules of the Road • (1964) • short story by Norman Spinrad
Jetsam • (1953) • short story by A. Bertram Chandler