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@kentpitman @screwtape Here are Mikkelsen's recollections about inventing ^R mode: https://github.com/PDP-10/its/pull/1353#issuecomment-430333457

Also, the EMACS LORE file mentioned in that issue is an early attempt (1978!) to document the history of Emacs. https://github.com/PDP-10/its/blob/master/doc/eak/emacs.lore