Pages specifically describing Barrett's Oesophagus (UK) / Barrett's Esophagus (US):
(Many have downloadable information.)
Images above courtesy of Medtronic whose page on Barrett's Esophagus may be accessed by clicking on them.
Past, Present & Future of Barrett's Oesophagus A position paper published by MRC Cancer Unit, University of Cambridge, February 2017
Links to pages from charities supporting acid reflux patients and fighting oesophageal cancer:
Other useful links about Barrett's: (N.B. you may encounter advertising on private hospital sites)
Barrett Esophagus Descriptive Article
And also from Johns Hopkins (pathology)