時間衝突
Collision with chronos
あらすじ（日本語）
異星人との戦争により過去の遺産がことごとく失われた地球。異星人が遺した遺跡を調べていた考古学者たちのもとに、驚くべき資料が届けられた。300年前に撮られた一枚の写真に、現在よりはるかに古びた遺跡の姿が写っていたのだ。遺跡は年とともに新しくなっているというのか？ 彼らは異星人の技術を用いてタイムマシンを開発し、過去へと旅立つ。未来から過去へ流れるというアイデアに真正面から挑んだ、波瀾万丈、究極の時間SF。
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あらすじ（英語）
<b>From the back cover of the DAW first edition:</b> "The ruins were getting younger. They were thought to be the ruins of an invading force of space monsters that men had defeated during the Dark Ages centuries before. But the ruins were visibly getting newer - rebuilding themselves. <p>The militarists who had reconstructed society after the supposed invasion were getting panicky. Until they found a complete invader vehicle - and learned it travelled through time. But what was Time? What was Now? Could there be more than one Time Front - one going forward, one in reverse? And what would happen when two such fronts met in the inevitable COLLISION COURSE?"
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