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The Depths of Time - Allen, Roger MacBride

Temporal wormholes are the only way to travel the vast distances between terraformed worlds and their human colonies. These timeshaft wormholes are closely guarded, preventing time paradoxes at all costs. When a patrol ship is attacked, all rules are blasted away in one deadly encounter--and it will take a miracle to restore balance to the galaxy.

The Depths of Time 2001, Bantam, New York, NY

ISBN-13: 9780553574975

Mass-market paperback

The Depths of Time 2000, Spectra Books, New York, NY

ISBN-13: 9780553378115

Trade paperback