_Colonizing Mars was hell, because of one thing--large, hungry critters. They flew, crawled, snarled, howled, burrowed up under the floors, chewed at doors and windows. And then, to make things worse, came the Monster...._ [Transcriber's Note: This etext was produced from Planet Stories July 1951. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.]…
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