Josef Schmid’s landmark publication, Studien zur Geschichte des Griechischen Apokalypse-Textes, has been the standard work for understanding the Apocalypse’s Greek manuscript tradition and textual history for more than sixty years. Despite the fact that most major studies on the Apocalypse of John are based on Schmid’s work, the work itself has long been out of print, making it difficult for the broader scholarly community to reassess Schmid’s conclusions in light of recent manuscript discoveries and technological advances. This book addresses this problem by providing a clear and accessible English translation, corrections throughout the text, updated data where necessary, and an introduction to help the reader understand Schmid’s place within the history of text-critical study of the Apocalypse.