The Guide to Reprints is the only single bibliography which collates unused, unrevised, commercially available reprinted titles, facsimiles and reissues of publishers worldwide. In its 2011 edition it comprises some 58,000 titles, from approx. 800 publishers and distributors: publications from a vast range of fields, such as bibliographies and encyclopedias, philosophical, historical, mathematical and physical treatises as well as all facets of literature. To meet the changing needs of readers, this bibliography now extends its scope to include titles which are obtainable exclusively as (re)print-on-demand. The Subject Guide divides works into over 200 subject groups, facilitating targeted searches by the subject fields.