Also mentioned in "The Colditz Story" by Pat Reid, a good book similar to the movie "The Great Escape". https://books.google.com/books/about/The_Colditz_Story.

Also mentioned in "The Colditz Story" by Pat Reid, a good book similar to the movie "The Great Escape". https://books.google.com/books/about/The_Colditz_Story.html?id=HYPWAwAAQBAJ https://books.google.com/books/about/The_Colditz_Story.html?...