JAE, I did a Google search for the 3rd LRFD Manual and found the number. I've checked with AISC, and they don't publish a comprehensive list of the numbers anywhere. They started numbering all of their books/manuals/codes, including the old ones, around 2002 to be like the other trades (ACI 318, ASCE 7, etc). That's why your green book doesn't have a number, nor your 3rd LRFD manual. And to further confuse things, the specificaton has a number, while the manual has a different number. The new documents do have these numbers printed on them for easy reference, but for the old ones, you're left searching around or e-mailing AISC. I had a specification the other day that referenced the green book and the green/blue Volume II by these 300-something numbers.
And I don't get the poorly-worded question comment. It's painfully obvious what the original poster was looking for.