Jeffrey D. Mancevice is a worldwide known specialist in incunabula, early printed books, mathematics, medicine, early science, Reformation and the Renaissance. He is located in Worcester, USA, has no website and sells “about 4 or 5 books a year through the internet”. For him the internet is the perfect research tool, but for the rare book business the international antiquarian book fairs are essential: There is no other way to sell rare and valuable books than through personal contact to collectors and librarians.  

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