"The papers of the Peace Tax Campaign are in The Commonweal collection, Bradford University: JB Priestley Library, which recently were donated to Special Collections. It consists of campaign minutes, correspondence including that of Stanley Keeble, one of the organisers, and correspondence with Members of Parliament". (from online catalogue)

Unfortunately, the collection is not yet fully catalogued so the online description is the most up-to-date information Dango has (see online catalogue).