It sounds like the SD card has become corrupted. You might need to use data recovery software and try to recover the pictures. One of the good data recovery software is PC Inspector File Recovery (free).
Generally the "corrupted" we said can be divided into logical corruption and physical corruption. When the device suffers logical corruption like reformatting or unintentional deletion of files, the lost data is recoverable. But when it suffers physical corruption such as exposure to high temperature, dropping, cracking, or water, the data will be very much likely unrecoverable.
Anyway you can try some photos recovery software,such as: disk-utilities.com/photo-recovery/ The trial version can let you preview the photos to see whether they are recoverable. Good luck!
Card Data Recovery is professional photo recovery software to recover deleted, lost, corrupted or formatted photos, videos, and auido files from various memory cards, such as, SDHC card, SD card, CF card, memory card, memory sticks, USB devices, digital cameras, hard drives, and zip drives. card-data-recovery.com.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.