Intended for use by archivists, curators, and others responsible for the acquisition and preservation of documentary materials in photographic form, this publication describes the nature of photographic media and recommended conservation measures. It is noted that the major emphasis is on black-and-white photographic materials, with some consideration of color photographs, films, and microforms. Chapters describe the role, importance, and physical nature of photographic materials; the principal silver and non-silver photographic processes; characterization and identification of photographic images by the support, binding medium, image-forming substance, and organic dyes used; techniques for the examination of photographic materials to determine the stability of their components; factors affecting the permanence of photographic materials; duplicating and copying of these materials; the processing of contemporary black-and-white photographs for maximum possible permanence; the testing of processed photographs and of materials used in their conservation; and the preservation, storage, and restoration of photographic items. Also presented are summary guidelines for conserving and restoring photographic materials, a 185-item bibliography, and a list of 30 RAMP (Records and Archives Management Programme) and related UNESCO documents. (ESR)