These Are Highly Credible Resources I Found for Safe Home Canning & Food Preservation
The National Center for Home Food Preservation - Includes Complete Guide to Home Canning, 2015 revision
The All-New Ball Blue Book of Canning and Preserving Published May 31, 2016 - This link will take you to Amazon.com
Home Canning and Botulism - From the U.S. Centers for Disease Control - No better experts here!
FoodSafety.gov - Great information on food poisoning.
Nutrition.gov - Nutrition information focused on safe food preservation & storage.
Canning & Freezing Tomatoes - 4-page summary from Iowa State Extension & Outreach. Nicely written, easy to follow.
University of Alaska Fairbanks Extension Service - Canned walrus anyone? Resources from a part of the country where food preservation is critical.