Larry,
E-mail isn't going to get you a letter. You need to send in a form requesting it and enclose a check to cover the cost.
Go to the
www.parkerguns.org page and on the left side of the page click on "Research Letters" and follow the instructions.
I suggest you think about joining the PGCA, the letter discount for members will help pay for the membership and you can have both at a cost savings.