Del Rey / Ballantine, 1980. Mass market paperback original anthology of stories. Includes: “The Sword of Damocles” by James P. Hogan; “Chains of Air, Web of Aether” by Philip K. Dick; “Grimm's Law” by L. Neil Smith; “Corpus Cryptic” by Lee Killough; “Elbow Room” by Marion Zimmer Bradley; “The Nobel Laureate” by Robert H. Curtis; “All That Glitters” by G. C. Edmondson; “The Subtle Serpent” by Charles Sheffield.