Title: No Time Like Tomorrow
First published: April 1, 1971
Description: From the back cover:

OUT OF THIS WORLD

A monster travels back in time to destroy a race called Man on a planet called Earth...

A mild-mannered husband is stranded centuries ahead in a world of peep-show barbarianism...

A jaded sportsman returns to the prehistoric past to hunt a gigantic brontosaurus...

The governor of a penal space settlement makes the supreme sacrifice for the colony he loves...

Here are startling stories -- adventures that soar beyond the barriers of time and space, yet remain perilously close to the boundaries of reality.
Subjects: Science fiction, Fiction, science fiction, general, Fiction, general, Time, Fiction, English Science fiction, Extraterrestrial beings, Robots