Wilhelm Research has released their book, The Permanence and Care of Color Photographs: Traditional and Digital Color Prints, Color Negatives, Slides, and Motion Pictures, by Henry Wilhelm with contributing author Carol Brower—originally published in 1993—as a free, downloadable PDF.
You can get the individual chapters here at Wilhelm Research’s site, or from this direct link to the whole thing in one 79.6MB PDF file.
While I haven’t read it yet, chapter titles such as "Traditional and Digital Color Prints, Color Negatives, and Color Slides: Which Products Last Longest?", "Print Mounting Adhesives and Techniques, Tapes, Rubber Stamps, Pencils, Inks, and Spotting Methods for Color and B&W Prints", "Display and Illumination of Color and Black and-White Prints", and "Handling and Preservation of Color Slide Collections" have bumped it to the top of my reading list.
Thanks, Wilhelm Research!
Via Silverprint News