Worlds of IF - Science Fiction: February 1967 Volume 17, No. 2
Illustrations by Jack Gaughan, Castellon, Gray Morrow, Vaughn Bode, Burns. Cover by Wenzel.

Novelettes: "The Soft Weapon" by Larry Niven ("Known Space" series - one of my favorite stories)
"Forest in the Sky" by Keith Laumer (a "Retief" tale)
"The Evil Ones" by Richard Wilson
"A Beachhead for Gree" by C. C. MacApp

Serial: "The Iron Thorn" (Part 2 of 4) by Algis Budrys (book title was The Amsirs and the Iron Thorn)

Stories: "Gods of the Dark and Light" by Bruce McAllister
"Confession" by Robert Ray
"The Dangers of Deepspace" by Mather H. Walker

Edited by Frederik Pohl; Judy-Lynn Benjamin is Associate editor. Fandom column by Lin Carter.