Beijing Silvermine is an archive of 850 000 negatives salvaged over the last ten years from a recycling plant on the edge of Beijing. Assembled by the French collector and artist Thomas Sauvin, Beijing Silvermine offers a unique photographic portrait of the Chinese capital and the life of its inhabitants in the decade following the Cultural Revolution.
This Yale website has archived an exhibition about printing.
From the site. https://printedpicture.artgallery.yale.edu/
This site explores an exhibition on the history of the printing of pictures held at The Museum of Modern Art, New York, in 2008-09. This exhibition and the book that it accompanied traced the dominant technologies used for printing pictures throughout the modern era. Richard Benson, who wrote the book and co-curated the exhibition, was videotaped for approximately eight hours in the Museum galleries. This site gives access to that entire talk with additional images and details, allowing visitors to the site to draw their own path through its contents.