(Contents information excerpted from The Internet Speculative Fiction Database)

Art:

• Hypothetical Planet by Mel Hunter
• Hoax by Frank Kelly Freas
• N4 N5 N6 by Paul Orban
• The Earthman by Ed Emshwiller
• Laboratory by Ed Emshwiller
• The Barbarians by Paul Orban
• Promised Planet by Mel Hunter
• The Happy Clown by Frank Kelly Freas
• Scene On Europa by Mel Hunter

Essays:

• The Odd Genre (If, December 1955) by Forrest J. Ackerman
• What Is Your Science I. Q.? (If, December 1955) by uncredited
• Worth Citing (If, December 1955) by uncredited
• Science Briefs (If, December 1955) by uncredited
• Hue and Cry (If, December 1955) by uncredited

Novelettes:

• Hoax by James E. Gunn
• The Earthman by Irving E. Cox, Jr.

Short Stories:

• N4 N5 N6 by James McKimmey, Jr.
• Laboratory by Jerome Bixby
• The Barbarians by Tom Godwin
• Promised Planet by Robert F. Young
• The Happy Clown by Alice Eleanor Jones