When our edition of John Dee's library catalogue (here referred to as R&W and its editors as RJR and AGW) was published in 1990 we hoped that the facsimile of the catalogue in Trinity College, Cambridge, together with facsimiles of Dee's hand and annotations, would lead to the identification of more of his books and to betterinformed discussion of the way in which he used them. These hopes have been sufficiently realised to encourage us to publish them in a format that will allow further discoveries to be incorporated. We had originally hoped to reprint the 1990 edition in toto but the expense of doing so turned out to be prohibitive for this reason the editions and corrections are now published on the Bibliographical Society's web-site.

Further discoveries of books and manuscripts from Dee's library have been made and discussed. We should mention first the proceedings of a conference held at Birkbeck College, University of London, in 1995, which have been updated and published under the editorship of Stephen Clucas as John Dee: Interdisciplinary Studies in English Renaissance Thought (Dordrecht, 2006). Some of these papers are referred to below. The volume also contains an early version of these additions and corrections by RJR, and, most usefully, a bibliography of recent (1988-2005) books on Dee.