Earth Factor X
earliest edition we have, 1976 Daw Books, 1976 paperback 174 pages
Reality twisted... slightly. Earth shivered. For a split second the Solar System wasn't. And then was again. Less than a billionth of a second -- but a time shift had nonetheless happened. As the shadow ship started to emerge from the time jump, men and aliens were locked in a secret, undeclared war for control of the Earth. Genetically altered, the aliens looked exactly like humans. And they were in positions of pow...
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