I saw the post concerning putting a piece of glass over photos to hold them flat. I cannot caution you enough to be sure these are not brittle if you do this or are not curled too much. It will crack them and ruin the original. This is what happened in a photography shop when the person doing the work was not knowledgeable enough to be coping old photos. Take those that are brittle to a well-known experienced person to have the copying done. It will be worth the price to preserve these. Marianne Crews