Guinness World Records, an annually published reference book filled with a collection of world records (both the human variety and those occurring in the natural wold), itself holds the world record as the best-selling copyrighted book series of all time.
It is also one of the books most often stolen from public libraries.
Paperback books first appeared in the United States around 1845. They virtually disappeared when the Copyright Act of 1891 banned the reprinting of English titles in paperback form. The books reappeared in 1936, when Allen Lane’s Penguin Press, an English publishing house, started to publish them again. By about 1980, about 70% of the books published in the U.S. are paperbacks.