By the 9th century, Muslims were using paper regularly, although for important works like copies of the revered Qur'an , vellum was still preferred.  Advances in book production and bookbinding were introduced.  [ unreliable source ] In Muslim countries they made books lighter—sewn with silk and bound with leather-covered paste boards; they had a flap that wrapped the book up when not in use. As paper was less reactive to humidity, the heavy boards were not needed. By the 12th century in Marrakech in Morocco a street was named "Kutubiyyin" or book sellers which contained more than 100 bookshops. 
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