Texts in multiple versions constitute the core problem of textual scholarship. For texts from antiquity and the medieval period, the many versions may be the result of manuscript transmission, requiring editors and readers to discriminate between levels of authority in variant readings produced along the chain of copying. For texts of all periods, and particularly for more modern authors, there may also be multiple authorial versions. These are of particular importance for genetic criticism, as they offer a window on the author's thinking through the developing work. The different contexts...