A few years ago on a trip to Israel, I went to the Holocaust Museum: Yad V' Shem. One of the final exhibits I saw was in the children's section where they had illustration from this book: "Mickey Mouse in Gurs: Published without permission from Walt Disney".
It was drawn by a guy named Horst Rosenthal who was a French Jew imprisoned in the Gurs Interment camp. I wanted to buy a copy for all of my animation friends to bring back as gifts but there weren't any for sale. When I got back to the states, I asked some cartoon historians about it but no one had heard of it. I also looked on line for references to it or information about it every so often but nothing ever came up- until recently. Click on the title to see the link.