From the book:
A shorter version of this work, published under the same title, is copyright 1960 by Poul Anderson.
The following stories composed the Earlier edition of The Guardians of Time:
Time Patrol, Brave to Be a King, The Only Game in Town & Delenda Est.
All appeared originally in the Magazine of Fantasy and Science Fiction, and are copyright by The Mercury Press respectively: 1955, 1960, and 1955.
This is the first book publication of Gibraltar Falls, which appeared originally in The Magazine of Fantasy and Science Fiction, copyright 1975 by the Mercury Press.
:Of Time and the Rover" by Sandra Miesel, is original to this edition and is copyright 1981 by Sandra Miesel