Time traders
(Book)

"Time traders has been previously published in parts as The time traders and Galactic derelict." --back cover.

"Intelligence agents have discovered that the USA's greatest adversary is sending its agents back through time! And someone or something unknown to our history is presenting them with technology far beyond our most advance science. We have only one option: creat time-transfer technology ourselves, find the opposition's ancient source and take it down. When small-time criminal Ross Murdock and Apache rancer Travis Fox stumble separately onto America's secret time travel project, their mere presence means that they know too much to go free. But Murdock and Fox have a thirst for adventure, and OOperation Retrograde offers that in spades. Both men become time agents, taking the battle to the enemy, from ancient Britain to prehistoric America, and finally to the farthest reaches of space." --back cover.