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 book trade contains the text of Duff's 1899 Sandars Lectures.William Caxton began printing in England in 1476 at Westminster, but most printers and booksellers working in England at that time were foreigners.Duff covers Westminster and London printing separately, and devotes individual chapters to the related trades of bookselling and bookbinding, which were often carried out by the same person.This reissue also contains Duff's lecture English Printing on Vellum, delivered in 1900.