→ See it full size: How Not To Die From Botulism at Northwest Edible Life
Recipes that have been tested for proper acidity and temperature may be found from sources like the National Center for Home Food Preservation, the So Easy To Preserve cookbook, the Ball cookbooks, and your local University Extension office. When using canning recipes from other cookbooks and blogs, it's a good idea to make sure the author exercises food safety principles. A few whom I trust include Marisa McClellan, Kevin West, and Kate Payne.
(Images: Northwest Edible Life)