Across A Billion Years by Robert Silverberg

Overall Good Condition, Fair Spine With Some Creases And slight Lean, Binding Tight, Pages Look Great
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Product Overview

Across A Billion Years 
by Robert Silverberg
Tor Books (1983) 
Scattered throughout the globe of human-occupied space is evidence of a civilization that bestrode the galaxy before humanity was born. Now, a strange device has been discovered that shows the details of that great civilization. The details include a star map and hints that the High Ones are not extinct after all. The map beckons, and humans, being what they are, will follow. To the next great step in human destiny--or ultimate disaster. The cover artist is Dell Harris.