This 1941 flyer by Kellogg has recipes for cookies to send to World War II soldiers. They use All-Bran, Corn Flakes and Rice Krispies and look like they are still do-able. The cover has  a cartoon image of a soldier opening a box of cookies with his fellow soldiers crowding around.  Opened, the sheet is 12 by 9 1/8 inches.  There's some wear on the 2 fold lines and a light crease.