Dictionaries, Telephone directories, atlases, world almanac
But seriously, many books give better written description than can ever be duplicated in film. When I was fourteen I remember reading The Amityville Horror—the book was extremely scary, kept me sleeping with the light on for several weeks. The movie was a real let down. As an adult, I re-read the book and discovered it was the fact that what was scary in the book was mostly psychological. It was subtle and atmospheric in spite of being a straightforward style. Nightmarish and meaningless but credible Stuff I could relate to—not overdone imagery and impossible to believe stuff of the movies.
The same might be said about the Narnia books—the movies failed to capture the uniquely British and legend-rich flavour of the writing of C.S. Lewis. which led much to the flavour and ambiance we read into the books.
Several books I read even as a child had beautiful description which has made me a descriptive writer even now, but would have been edited out of a film.
I think they did do a good job on the three Lord of the Rings movies and MOST of the Harry Potter films, however. Better than my imagination when reading the material