The first edition of The Ingenious Gentleman Don Quixote of La Mancha was printed in Madrid in 1605. Around 31 copies remain today.

Most of them are found in public institutions, such as the Royal Spanish Academy or the National Library. The three criteria that determine the bibliographic value of a book are: interest, beauty and rarity. The Bardón sisters know a lot about these matters, current owners of one of the oldest bookstores in Spain, with a collection of around 50,000 copies.