Just noticied your post - I think you're on the right track. The oldest bakery in Bakersfield is Pyrenees French Bakery. It's French Basque and it's most popular bread is sourdough.
717 E 21st St
Bakersfield, CA 93305
One of the other nice things about Pyrenee's Bakery is they don't put any additives in their bread (at least not in the types of their bread that I buy). Pyrenee's bread can be found in most local grocery stores, too, and if you look at a Pyrenee's baguette bag, the ingredients are simply flour, water, yeast and salt...or something along those lines. That's refreshing to see these days.