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The Creeps: Mysterious aliens locked in a death struggle with the human race, diabolically clever in their ability to mimic human devices and tactics. The war between humanity and the Creeps had lasted for years; a war so savage that human combatants were issued a daily drug ration to keep them sane. But one soldier was immune to the drug, and learned the unspeakable secret of the Creeps - and the war ...
Used availability for David S Garnett's Mirror in the Sky
September 1973 : UK Hardback