Contents (view Concise Listing)

• 4 • The Race for Space • [Editorial (If)] • essay by Frederik Pohl [as by The Editor]
• 6 • Prisoners of the Sky • novella by C. C. MacApp
• 9 •  Prisoners of the Sky • interior artwork by Gray Morrow [as by Morrow]
• 50 • Build We Must • short story by Dannie Plachta
• 52 • The Kettle Black • novelette by Steve Buchanan
• 53 •  The Kettle Black • interior artwork by Nodel
• 70 • Nine Hundred Grandmothers • [Habitable Worlds] • short story by R. A. Lafferty
• 79 • Not by Sea • novelette by Howard L. Morris
• 81 •  Not by Sea • interior artwork by Jack Gaughan [as by Gaughan]
• 97 • The Peak Lords • short story by Miriam Allen deFord
• 103 • The Moon Is a Harsh Mistress (Part 3 of 5) • serial by Robert A. Heinlein
• 105 •  The Moon Is a Harsh Mistress (Part 3 of 5) • interior artwork by Gray Morrow
• 148 • The Warriors • [Known Space] • short story by Larry Niven
• 160 • Hue and Cry (If, February 1966) • [Hue and Cry] • essay by Frederik Pohl [as by The Editor]