_Rhizoids--fabulous gems that harnessed every brilliant sun of the Galaxy--these were the kill-stones that sent space rat Mallard racing for the forbidden swamp belt of Mercury ... into a lurid land that beckoned the get-rich-quick riff-raff._ [Transcriber's Note: This etext was produced from Planet Stories November 1952. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.]…
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