Analog Science Fiction / Science Fact, January 1971 (Vol. LXXXVI, No. 5) edited by John W. Campbell, with cover art by Kelly Freas and interior illustrations by Kelly Freas, Vincent Di Fate, David Cook, and Leo Summers. Fiction and non-fiction contents include: The Tactics of Mistake, the conclusion of a four-part serial by Gordon R. Dickson; The Telzey Toy, a novelette by James H. Schmitz; Sprog, a novelette by Jack Wodhams; Homage, a short story by Tak Hallus; The Enemy, a short story by M. R. Anver; The Scientific Gap in Law Enforcement, a science fact article by James Vandiver; and The Baby in the Bath Water, an editorial by John W. Campbell. Regular features include: The Analytical Laboratory; In Times to Come; The Reference Library, with book reviews by P. Schuyler Miller; and Brass Tacks, with letters from the readers.