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cerv's review
4.0
This is a Paratime story. I like them. Eventually I'll read all of them. Involves transdimensional travel. This one is particular is a "modern day man (1964) is transported to alternate Earth of much less technology and uses his skills to do well." It's not really isekai because the alternate Earth advanced race has a machine that lets them travel to any other Earth at will and exploit them for resources.
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