It may be worthwhile identifying exactly what they are, as some early image technologies need to be stored in special ways. If there is an art museum or better yet a history museum with a good archive near by call and ask to speak with the photo-curator. Perhaps you can interest her or him enough to look at the images, identify them, and then suggest ways of storing them. In any case, keep them out of direct sunlight until you know exactly what they are, and how to treat them. Good luck!