The Center for Native American and Indigenous Research at the American Philosophical Society brought together this volume of historical and contemporary case studies highlighting the importance of archival materials for the revitalization of Indigenous languages. Essays written by archivists, historians, anthropologists, knowledge-keepers, and museum professionals, cover topics critical to language revitalization work; they tackle long-standing debates about ownership, access, and control of Indigenous materials stored in repositories; and they suggest strategies for how to decolonize collections in the service of community-based priorities. Together these essays reveal the power of collaboration for breathing new life into historical documents.