Percy Muir's career as a book collector, bibliographer, book historian, and senior member of the British antiquarian book trade spanned some sixty years of the twentieth century. His main contribution to the book world was to promote wider interest in book collecting as a humanistic pursuit rather than as a way of investing money. His ideas about collecting had a considerable influence on the development of new patterns in the traditional book trade and the outlook of his younger colleagues. Written in a clear, direct, informative style, his books appealed to a wide readership. He firmly believed in the partnership of collectors and booksellers and worked tirelessly to promote better understanding between the two. He also believed in making the British book trade more ethical, more professional, and less insular, and his unwavering commitment to the International League of Antiquarian Booksellers gave the membership of the Antiquarian Booksellers...