This is a CD This is the Overhaul manual for the 0-300 series Continental aircraft engines, whether in a piper, mooney, cessna, beechcraft, bellanca etc. you need this manual on a CD.
These manuals are probably non current and are sold for educational reference purposes only.
Please check my store for more piper , cessna and beechcraft manuals Continental 0-300 service manual, 0-300 overhaul service manual