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Ecotopia by Ernest Callenbach (1975) -- Northern California, Oregon and Washington have succeed from the US to from the nation of Ecotopia.
* Kim Stanley Robinson's Three California's --Three Novels each set in different future Orange County, California. I haven't read these in part because they only seem to be available in trade paperback, and that's expensive for a book I'm not sure I'll like. Maybe I'll try the library
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Always Coming Home By Ursula K Le Guin -- This book is hard to explain, it is rather anthropological. It is about the Kesh who "might be going to have lived a long, long time from now in Northern California." The book has collections of there stories and songs, as well as one woman's story, and some notes on there culture.
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Sliders (1995-2000) A TV series where a group of people form our world travel to many alternate San Fransiscos. I've seen a few episodes but didn't really like it
* Much of the work of Philip K Dick -- I haven't read much of this because I found what I have read to be very depressing.
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The City, Not Long After by Pat Murphy (1989) --Set in San Fransisco after a plague has destroyed civilization as we know it.
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Remake by Connie Willis (1995) -- set in future Hollywood.
There are more (If you go
Here and search "Science Fiction" you can get a long list of other things most of which are science fiction. That is also not a complete list, because it doesn't include most of my list)
If there is any science fiction set in California that you think I might like to know about, read or watch please let me know.