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In contrast, hardcover or hardback books are bound with cardboard covered with cloth; although more expensive, hardbacks are more durable. Inexpensive books bound in paper have existed since at least the 19th century in such forms as pamphlets, yellowbacks, dime novels, and airport novels.[1] Many paperbacks used parchment a type of sheepskin to bind the books, because it was the cheapest production costs. Higher quality more expensive binding material was called Vellum which was a type of Calfskin, but it a lot less commonly used.

Schick, Frank L. The Paperbound Book In America; The History of Paperbacks and Their European Backgrounds. R.R. Bowker Company (1958). HATHI TRUST. Web. 10 October 2015.>