That's easy.
Complete Guide to Home Canning .
This is my preserving bible you might say,it is put out by US dept agriculture, best up to date guide I have seen and I have lots of these books as we preserve just about everything.
It covers everything from jam to meat,including safety etc. I would not preserve without it.
You can buy it but it is free online, you can just print it off or refer to it online.
XX Jeannine