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In page Andre Norton bibliography:

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"

Featuring the Forerunners, an incomprehensible yet powerful vanished alien race whose artefacts survive them.

  • Forerunner Foray (1973)
  • Forerunner (1981) – the first book published by Tom Doherty Associates under the Tor Books imprint[citation needed]
  • Forerunner: The Second Venture (1985)