Book excerpt: A distinguished international group of diplomatists address thirteen cases of transmission and preservation of medieval documents. A recurrent theme in this volume is the actual preservation of individual original charters, but the content of originals was transmitted in other ways as well. Several chapters discuss questions relating to recopied originals, cartularies, and a range of other archival practices for retaining documents during the Middle Ages. Many of the authors focus on how documents were organized in archives and in cartularies during the period. Others discuss the notions of "original document" and "copy"--Both their relationship to each other and to the legal validity of the document in question.