Murray Leinster 
Get Off My World! 

PLANET OF SAND: A world literally bald, completely covered by sand and devoid of life — or so the stranded spaceman thought until he saw the huge menacing girders whose origin and purpose he could not begin to fathom.WHITE SPOT: A gold locket containing a picture of a girl, found in millennia-old ruins on a planet some hundreds of light-years from Earth, threatens the existence of the entire human race.SECOND LANDING: A lost space team lands on a deserted planet, entirely unprepared for the strange world’s one citizen; a great white amoeboid monster, hiding in wait to wreak its fury on any intruders.