Analog Science Fiction / Science Fact, May 1967

Cover art by Kelly Freas illustrating "Of Terrans Bearing Gifts" by Richard Grey Sipes. ALSO: "The Time-Machined Saga" (serial, part 3 of 3) by Harry Harrison; "Burden of Proof" [Slow Glass] by by Bob Shaw; plus stories by Christopher Anvil and Mike Hodous. FEATURES: Editorial by John W. Campbell; science essay: "Target: Language" by Lawrence A. Perkins; The Reference Library (book reviews) by P. Schuyler Miller, Brass Tacks (letters). Interior artwork by: John Schoenherr, Kelly Freas. Magazine editor: John W. Campbell.