Former military engineer Manse Everard is recruited by the Time Patrol to prevent time travelers from making major changes to history (history bounces back from the small stuff).

For me, the logic of these stories pushes in a good direction, but still leaves one gaping hole that’s evinced by the fate of Manse’s compatriot Keith Denison in “Brave to Be a King”—namely, what happened to the younger Denison? Perhaps my problem is simply that I don’t grok ℵ-valued logic.

The stories have been collected in various volumes, the most complete of which is the 2006 Time Patrol that contains all but The Shield of Time.
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.

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  1. “Time Patrol,” Magazine of Fantasy and Science Fiction, May 1955.