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Documents of Essex England Data Set (DEEDS) was founded in 1975 by Professor Michael Gervers to create a database of information culled from medieval English property exchange documents which would be of interest to social and economic historians. [...]Very few English documents issued before 1300 were securely dated. We are on the verge of developing a revolutionary method for dating the tens of thousands of medieval charters which still exist in English repositories and which have not been fully exploited because of their uncertain chronology. [...]  (website)The project website contains a few articles in full-text, but the newest article is from 1998. The website does'nt mention the book "Dating undated medieval charters" (2000) [Contents], the papers of a 1999 Budapest conference (reviewed in German by Jürgen Römer, in: Das Mittelalter 7 (2002) H. 1, S. 192-194). See Manfred Thaller's review in The Medieval Review.