The essays in Private Libraries and their Documentation revolve around the users and contents of early modern private book collections, and around the sources used to document and study these collections. They take the reader from large-scale projects on historical book ownership to micro-level research conducted on individual libraries, and from analyses of specific types of primary sources to general typologies and overviews by period and by region. As a result of its comparative approach and active engagement with questions regarding the nature, selection and accessibility of sources, the volume serves as a guide to sources and resources in different regions as well as to state-of the-art methods and interpretational approaches. Publication of this volume in open access was made possible by the Ammodo KNAW Award 2017 for Humanities.