My ideas have to do with "fixing" the one photo you have in your possession. There are new advances in photographic software tools that will allow "repair" of the photo. It is scanned in the highest possible resolution and then cracks & spots are repaired using the software. I've had good results. If you do not have equipment, call a college art department and see if you can pay a fee to have a student / teaching assistant do it for you. Try YELLOW PAGES "Photographers" as well. Good LUCK!