Photographic gelatin : proceedings of the Second Symposium on Photographic Gelatin held at Trinity College, Cambridge, August-September, 1970 - Symposium on Photographic Gelatin, 2d, Trinity College, Cambridge, Eng., 1970; Cox, R. J.; Royal Photographic Society of Great Britain. Scientific and Technical Group (Academic Press for The Scientific and Technical Group of the Royal Photographic Society, 1972)