The 100th Millennium / Edge of Time(1959)
An omnibus of novels by John Brunner and David Grinnell (Donald A Wollheim)
Ace Double book, 1959. Mass market paperback. "The 100th Millennium" was first published as "Earth is But A Star" in Science-Fantasy Magazine, June 1958. It was later rewritten and published as "Catch a Falling Star: (1968). "Edge of Time" was first published in hardcover by Avalon Books in 1958. "David Grinnell" is a pseudonym of the late Donald A. Wollheim.
Used availability for John Brunner's The 100th Millennium / Edge of Time
1958 : USA Mass Market Paperback