The book Old King Cole is recorded as the smallest book in the Welsh National Library, measuring 0.9mm by 1mm, as verified by the Guinness Book of World Records. Published in 1985 by Glennifer Press, it has held this title for 20 years. The 12-page single-sided book contains the British nursery rhyme “Old King Cole” and is printed on the finest 22gsm English paper. The pages can only by turned with a needle.