Harold Orton died soon after this in March 1975. "The Linguistic Atlas of England" was published in 1978, edited by Orton, John Widdowson and Clive Upton. Two further publications have been produced from the survey's material, "Survey of English Dialect: the Dictionary and Grammar" (1993) and "An Atlas of English Dialects" (1996), both co-authored by Upton and Widdowson. It was originally planned to published four "Companion Volumes" of selected incidental material, to correspond with the four volumes of the basic material. These were designed to investigate the development of the chief Middle English sounds, and of certain morphological features and syntactical usages, in each locality. A large amount of "incidental material" from the survey was not published. This is preserved at the Leeds Archive of Vernacular Culture, part of the School of English of the University of Leeds. During the survey, each locality was given an identifying abbreviation, which is given in brackets. The output of the Survey was criticised by some linguists as outdated. In a review of "The Linguistic Atlas of England" John C Wells wrote, "the phonetic approach of the survey's scholars is pure nineteenth century: it takes no account of structuralist phonemics, let alone more recent developments in phonological theory." He suggested that the survey should have been "The Linguistic Atlas of Working-class Rural England", and said that many well-known features of contemporary urban accents were not recorded in the Atlas. Similar criticisms of the sample were made by sociolinguists such as Peter Trudgill and Jack Chambers. However, Sarah Elizabeth Haigh has said that this "seems to rather miss the point of the survey", which was to record dialects before they died out and was not to represent contemporary speech. KM Petyt has highlighted the problem of using several fieldworkers in the same survey and suggested that some of the isoglosses are really "iso-fieldworkers". He gives the subtle distinction between the sounds ɔ and ɒ as an example of inconsistent recording in the survey, where some fieldworkers tended to write ɔ and others tended to write ɒ. Mark J. Jones has noted that the transcriptions for the SED do not always match the tape recordings made, most notably in the under-reporting of glottal stops. He wrote, "This is an unsurprising and expected consequence of impressionistic transcription, particularly when running speech is being transcribed, and in no way detracts from the feat achieved by the SED fieldworkers."