Byron,
There probably aren't too many people who are still above ground and breathing that have firsthand knowledge of of the location and history of Don Martinez's Fly Shop...
Here are a couple of leads for you that might help:
http://flyfishyellowstone.blogspot.com/
The above guy knows a lot about the history of West Yellowstone...might be worth it to shoot him an inquiry...
http://www.yellowstonehistoriccenter.org/index.php
Those folks might be able to assist ya'...
http://www.amazon.com/Ribbons-Blue-A.../dp/1560371196
The above book by Pat Barnes might have information...
...or the West Yellowstone CofC...
http://www.destinationyellowstone.com/
I was in Pat Barnes' Shop back in October of '77 and got these clunky waders there that I am wearing on the Firehole, my dad took the photo:
PT/TB