Tom Conroy (1987), “The Movement of the Book Spine”, The Book and Paper Group Annual, 6. http://cool.conservation-us.org/coolaic/sg/bpg/annual/v06/bp06-01.html (accessed March 2015).
Tom Conroy (1987), “The Movement of the Book Spine”, The Book and Paper Group Annual, 6. http://cool.conservation-us.org/coolaic/sg/bpg/annual/v06/bp06-01.html (accessed March 2015).