Five volumes of text were published by Harvard University Press between 1985 and 2012: Volume I (A–C), with Frederic G. Cassidy serving as Chief Editor, appeared in 1985; Volume II (D–H), edited by Cassidy and Associate Editor Joan Houston Hall, was published in 1991; Volume III (I–O), by Cassidy and Hall, came out in 1996; Volume IV (P–Sk), by Hall, who succeeded Cassidy as Chief Editor upon his death, appeared in 2002; and Volume V (Sl–Z), with Hall as editor, finished the set in 2012. A sixth volume, subtitled "Contrastive Maps, Index to Entry Labels, Questionnaire, and Fieldwork Data," edited by Hall with Luanne von Schneidemesser serving as Senior Editor, was published early in 2013. Late that same year, the digital version was launched.