Paratime Series
The Paratime series written by H. Beam Piper consists of several short stories, one novella, and one novel; they deal with an advanced civilization that is able to travel between parallel universes with alternate histories, and uses that ability to trade for goods and services their own, exhausted Earth cannot provide. Specifically, the Paratime series deals with the Paratime Police, the organization that protects the secret of paratime travel.
Read more about Paratime Series: Stories in The Paratime Series, The Paratime Levels, Travelling Through Timelines, The Home Timeline, The Paratime Secret and The Paratime Police, Characters in The Paratime Series, The Influence of Piper's Paratime On Other Art
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