Ca.1965 Remington Rangemaster 40X Instruction Folder,3-1/8" x 6-3/4" closed and opens fully to 12-3/8" x 13-1/4".There are directions for disassembly,operation and care of the rifle.Also a sectional view with parts labeled.There is an address for correspondence with Remington with the Zip Code added in ink,which I believe dates it mid-1960's. Excellent Condition with the original translucent envelope