The Dictionary of American Regional English is an historical dictionary of the regional and folk language of the United States. It is based on a wide range of sources, including a special project of nationwide fieldwork carried out from 1965–70. Special features are the extensive use of regional and social labelling, both of individual quotations and at the entry and sense level, and the inclusion of schematic maps based on the fieldwork. The dictionary was published by Harvard University Press in five volumes from 1985–2012, followed by a sixth volume of supplementary materials in 2013. Since the beginning of 2014 it has also been available in an online format embodying a corrected and enhanced version of the dictionary text, as well as a module that allows users to access the DARE survey data and to map selected responses. The online version is updated at intervals to incorporate new and revised entries.