Helms sells factory service manuals to the public. There are usually 6 or 7 per set, per year, and a set may only cover one model car. They are the most detailed when purchased as a set, but they can actually be kind of cumbersome. Mitchell makes several series as well, but theirs are brokem up into domestics/imports and cars/trucks. Then, they have Chassis, wiring, accessories, emissions, diagnostics, etc. Many, many, many to have. They are my preference, but it would cost me $50k just to get a complete set for the last 30 years. There is also MOD (Mitchell On Demand), and Alldata, which both offer a service on CD-Roms. You pay them something like $1000 - $3000 per year (depending on the size of your shop), and then an aditional $149 a month. In exchange, you get CD's with info on every car made, as well as access to their online data bank. Too much for me.
I have several difrferent Mitchell's volumes, and dozens of Haynes and Chiltons, for various models. I have a few sets of factory service manuals, too. It's kinda funny, because I always need a book I don't have, and I rarely go into the ones I do have, excpet for specs.
Take care,
~Chris
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