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    Minus Planet by  John D. Clark, Ph.D: 
      Science Fiction Inventions, Technology and Ideas
    "There was one projectile big enough to make a dent in the planet's path — the Moon — and they could spare it."
  
  
('Minus Planet' by John Clark)
This is an early story about antimatter - the story calls it "minus elements":
 
 
And now one makes a whole universe with these minus elements. And one makes oneself out of them, too, and lives in the place, and can’t tell the difference between it and a regular universe. All the physical laws will be the same — but just wait until part of your new universe hits part of a regular universe!
 
 Select
      an invention: 
    
         Antron  A single particle of antimatter - an antiproton.
           
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         Atomic Drill  An atomic-powered auger, for use in drilling deep into planets and asteroids.
           
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