The Door Into Summer. Here's the passage where he describes an edition of "the Great Los Angeles Times, for Wednesday, 13 December, 2000":
Newspapers had not changed much, not in format. This one was tabloid size, the paper was glazed instead of rough pulp and the illustrations were either full color, or black-and-white stereo -- I couldn't puzzle out the gimmick on that last. ...Uncanny, I think! O Robert Heinlein! The inventor of so many good things!
I could not find out how to open the durned thing. The sheets seemed to have frozen solid.
Finally I accidentally touched the lower right-hand corner of the first sheet; it curled up and out of the way...some surface-charge phenomenon, triggered at that point. The other pages got neatly out of the way in succession whenever I touched that spot. (122)