Behold, the Tiniest of Books - The New York Times

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Most of the books in the exhibit are about one to three inches high and would nestle easily in the palm of your hand. Some are the size of a thumbnail. (There are also a few ultra-micro-miniatures, with no dimension greater than a quarter of an inch; one, shockingly, looks to be about as big as the period in this sentence.) The oldest is a cuneiform tablet from about 2300 B.C.; the newest was published last year. They are valued in the tens or hundreds or thousands of dollars; the rarest of miniature antiquarian books can sell in the six or even seven figures.
From Behold, the Tiniest of Books - The New York Times