How much are my old and used books worth? Mare Magnum 26 March 2019 15:28 Updated Follow If you have old and used books and you want to know their value, Maremagnum.com provides valuable tools to carry out an evaluation in total autonomy. See also www.marelibrorum.com Related articles I want to cancel my account. How can I do that? I have made a purchase. How can I track my order? I don't know any terms and/or abbreviations I keep getting reminders of payments. What should I do? I want to unsubscribe from the Maremagnum.com newsletter. How can I do that? Comments 0 comments Please sign in to leave a comment.