http://nchfp.uga.edu/how/can_04/potato_white.html pressured canned them for 40 minutes. http://nchfp.uga.edu/how/can_04/potato_white.html How to home can potatoes. http://nchfp.uga.edu/how/can_04/potato_white.html National Center for Home Preservation recipe from National Center for Home Food Preservation