"reading matter" is a correct phrase in written English, and it can be used to refer to books, magazines, newspapers, etc.
For example: "I've been trying to get through my reading matter quickly."
Gone is the panic of running out of reading matter.
As for reading matter, well, you can imagine.
During the recent newspaper strike, a businessman was desperate for reading matter.
London contributed reading matter, including Milton and Darwin, for the cabin-bound winter.
Commercial and reform interests combined in the proliferation of reading matter for the "popular classes".
The shortage of foreign reading matter has coincided with a surge of intellectual activity.
Possessions — paper and pencil, reading matter, photos of family members, even hand-drawn pictures — are removed.
By any measure, we have an astounding surplus of reading matter.
"No other press so extensively furnished the German soldiers with reading matter".
I had run out of reading matter, so I entered, hopefully.
Anything by Leon Garfield is also ideal reading matter for the cold hinge of the year.
