Rescue Party

by Arthur C. Clarke

But Alveron and his kind had been lords of the Universe since the dawn of history, since that far distant age when the Time Barrier had been folded round the cosmos by the unknown powers that lay beyond the Beginning.

The End of Eternity

by Isaac Asimov

Time Patrol 1

Time Patrol

by Poul Anderson

If you went back to, I would guess, 1946, and worked to prevent your parents’ marriage in 1947, you would still have existed in that year; you would not go out of existence just because you had influenced events. The same would apply even if you had only been in 1946 one microsecond before shooting the man who would otherwise have become your father.

The End of Eternity

by Isaac Asimov

He had boarded the kettle in the 575th Century, the base of operations assigned to him two years earlier. At the time the 575th had been the farthest upwhen he had ever traveled. Now he was moving upwhen to the 2456th Century.

“—All You Zombies—”

by Robert A. Heinlein

When I opened you, I found a mess. I sent for the Chief of Surgery while I got the baby out, then we held a consultation with you on the table—and worked for hours to salvage what we could. You had two full sets of organs, both immature, but with the female set well enough developed for you to have a baby. They could never be any use to you again, so we took them out and rearranged things so that you can develop properly as a man.

Time Patrol 2

Brave to Be a King

by Poul Anderson

In the case of a missing man, you were not required to search for him just because a record somewhere said you had done so. But how else would you stand a chance of finding him? You might possibly go back and thereby change events so that you did find him after all—in which case the report you filed would “always” have recorded your success, and you alone would know the “former” truth.

Future Science Fiction, February 1960

Through Other Eyes

by R. A. Lafferty

“And watching the great Pythagorous at work.”
“And the three days that he spent on that little surveying problem. How one longed to hand him a slide-rule through the barrier and explain its working.”

The Six Fingers of Time

by R. A. Lafferty

I awoke this morning to some very puzzling incidents. It seemed that time itself had stopped, or that the whole world had gone into super-slow motion.

First through Time

by Rex Gordon

The Deadly Mission of Phineas Snodgrass

by Frederik Pohl

Snodgrass decided to make the Roman world healthy and to keep its people alive through 20th century medicine.

Light of Other Days

by Bob Shaw

Apart from its stupendous novelty value, the commercial success of slow glass was founded on the fact that having a scenedow was the exact emotional equivalent of owning land.

The Utterly Perfect Murder

by Ray Bradbury

I tossed the few bits of gravel and did the thing that had never been done, ever in my life.

The Pure Product

by John Kessel

“I said, have you got something going,” she repeated, still with the accent—the accent of my own time.

Ripples in the Dirac Sea

by Geoffrey A. Landis

1. Travel is possible only into the past.
2. The object transported will return to exactly the time and place of departure.
3. It is not possible to bring objects from the past to the present.
4. Actions in the past cannot change the present.