A very nice signed first edition book, "Stereoscopes, The First One Hundred Years", by Paul Wing. Signed by Paul Wing to Bernard Clfton, in 2001. Also five letters to Mr. Clifton, signed by Paul Wing. Plus Bernard Cliftons letter to Paul Wing. Mr. Clifton was an optical expert, and an avid stereoview collector. All of the letters are from the early 1970's. The book is in excellent condition. Shipping and insurance in the U.S. are free.