Del Rey, New York, 1981, 11th pr. thus.  ISBN 0-345-29665-6.  MMPB, 285 pages.  Wraps have edge and cover wear, diagonal crease on front wrap, reading crease along front and rear spine edges, scar at upper right corner; tight binding.  Interior clean and unmarked with lightly tanned pages.  Stories include:  Neutron Star, A Relic of the Empire, At the Core, The Soft Weapon, Flatlander, The Ethics of Madness, The Handicapped, and Grendel.  ‘Come to Larry Niven’s Universe and meet all the natives:  Thrints, Bandersnatchi, Puppeteers – and a host of other wonderfully created characters.  Visit Lookitthat, Down, and Jinx – indeed, an entire galaxy of planets found only in these stories that trace man’s expansion and colonization throughout Known Space.’ (from rear wrap)