(Contents information excerpted from The Internet Speculative Fiction Database)

Art:

• The Rings of Saturn by Ed Valigursky
• A Case of Conscience by Ed Emshwiller
• The Trouble with Bubbles by Joseph Eberle
• Planet of Dreams by Paul Orban
• Thy Rocks and Rills by Tom Beecham
• The Romantic Analogue by Ed Emshwiller
• In the Forest by Dick Rockwell
• Titan by Ed Valigursky

Essays:

• A Chat with the Editor (If, September 1953) by Larry T. Shaw
• Personalities in Science: Guglielmo Marconi by Eve P. Wulff
• Science Briefs (If, September 1953) by uncredited
• The Postman Cometh (If, September 1953) by uncredited
• Letter (If, September 1953): Wide Margin for Error by Richard Deming

Novelette:

• Thy Rocks and Rills by Robert E. Gilbert

Novella:

• A Case of Conscience by James Blish

Short Stories:

• The Trouble with Bubbles by Philip K. Dick
• Planet of Dreams by James McKimmey, Jr.
• The Romantic Analogue by W. W. Skupeldyckle
• In the Forest by Leslie Perri