Where can safe and reliable instructions (including high and low altitude canning) be found for canning?
The Ball Complete Book of Home Preserving includes a section that does just what you're asking. It also provides a large collection of excellent recipes and general tips and tricks.
The National Center for Home Food Preservation is your source for current research-based recommendations for most methods of home food preservation. The Center was established with funding from the Cooperative State Research, Education and Extension Service, U.S. Department of Agriculture (CSREES-USDA) to address food safety concerns for those who practice and teach home food preservation and processing methods.