For all the folks that like to have apps on their phones. Mother Earth News has an app on how to can.
They tell you how to can fruits and vegetable safely. It works on Apple and Android devices. Looks pretty cool. Tells you how many quarts a bushel of something should weigh and how many quarts that bushel should can into.
MOTHER EARTH NEWS How to Can App
http://www.motherearthnews.com/real-food/how-to-can-app-zb0z11zmat.aspx#axzz2SM6Vbuqs