The USDA Canning Guide (1994)
http://foodsafety.psu.edu/canningguide.htmlIt is also in book form, but the guidelines have changed, so if you run across a print version, be sure it is 1994 or later.
If you use any other canning guide (there are many) and the info conflicts with the canning guide above, go with the USDA 1994+ version for safety.