Project Mastodon

Story, first published: Galaxy Science Fiction, March 1955

In the fifties and sixties, Simak had written a couple of short stories in which he imagined time travel employed by a business - profitably - to ferry tourists back in time. "Project Mastodon" ... had some entrepreneurial time travelers trying to form a separate nation in the past called Mastodonia.

Ewald, Robert J.: When the Fires Burn High and the Wind is from the North, p.113