SF. Ace Double- John Brunner "Times Without Number" / David Grinnell "Destiny's Orbit"

Times Without Number - John Brunner.

Multiply the Earth by three and the future by infinity.  Travelling backwards in time Don Miguel had to undo the errors and interruptions of other time-interlopers.

Destiny's Orbit - David Grinnell

Though Ajax Calkins was wealthy enough to buy anything on Earth his heart desired, what he wanted most was strictly forbidden - a world of his own, a planet, however small that would be his private kingdom in the sky.   When a bearded stranger opened the way to such an adventure, Ajax leapt at the chance.  In his luxury spacecraft, Destiny he shot out through the inner planets to a tiny world that waited a king, and, unwittingly to a monsterouter-planet empire that waited a detonator for cosmic war.

A 1962Ace paperback in fair  condition based on the Hancer Standard.