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GardenWeb Guide to Canning Vegetables
Follow the instructions of your canner. Successfully following instructions will ensure that the temperature is high enough to kill harmful bacteria (240-250 degrees F), and will ensure that lids are sealed correctly. Your canner should come with a table for the required cooking time for different vegetables, but you can also use this reference: http://www.ext.colostate.edu/pubs/foodnut/09348.html.