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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!
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