The Doors of the Universe(1981)
(The third book in the Children of the Star series)
A novel by Sylvia Engdahl
With genetic engineering promising salvation for the people on their hostile planet, the Scholar Noren finds he faces more problems than overcoming the taboo on genetic research.
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Used availability for Sylvia Engdahl's The Doors of the Universe
March 1981 : USA Library Binding
September 2008 : USA, Canada, UK Kindle edition