This is from technovelgy.com, a website devoted to "creative ideas and inventions of science fiction writers".
In 1961 in
Return From The Stars Stanislaw Lem described an eBook device called The Opton.
Quote:
The books were crystals with recorded contents. They can be read the aid of an opton, which was similar to a book but had only one page between the covers. At a touch, successive pages of the text appeared on it.
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Fascinatingly accurate description of today's eBooks and eBook hardware.
More
here