On 22 June 1940, Alan Keen, a dealer in antiquarian books, discovered an extensively annotated copy of Hall's "Chronicle" among the contents of a library from outside London which he had just purchased. Keen considered that the marginal annotations, most of which are found in the chapters covering the reigns of Henry IV, Henry V, and Henry VI, were made by Shakespeare. Keen published his findings in two journal articles, and in a book co-authored with Alan Lubbock in 1954, "The Annotator". After his death Keen left the volume in the hands of trustees, who placed it in the British Library, where until 2007 it was catalogued as Loan MS 61.