Edward Gordon Duff (1863-1924) was a bibliographer and librarian with a particular interest in early printed books. He was librarian of the John Rylands Library, Manchester, from 1893 to 1900, and Sandars Reader in Bibliography at Cambridge in 1899, 1904 and 1911. Alongside research and writing he also did freelance cataloguing. Duff's work set new standards of accuracy in bibliography, which he considered a science. This study of the early London...