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.
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.
Fascinatingly accurate description of today's eBooks and eBook hardware.