You've mentioned having letters and journals from the early twentieth century. I assume they are in Spanish. Don't you think that if you gave copies to your local libraries that other people of similar heritage might appreciate reading them? And it' s not just your history, it's the history of all Texans.
When your grandparents were migrant workers in West Texas they might have set up their camp on my grandparents' ranch some Summers. My mother remembers watching the Mexicans build clay ovens in which to cook tortillas; of picking up their pinto beans and flour each week when they took the wagon into town.
I remember when Mexicans were considered our neighbors, not our "invaders" and when Spanish was mandatory in Texas schools.
My grandparents were Americans, not Mexicans. And, it wasn't my grandparents who were migrant workers, it was my parents (children of the Depression whose parents lost their farms).
Having journals from the past in ALL languages or in a special collection (such as the Turkish Oral History narrative at Texas Tech) is a wonderful idea for a library. Having bathroom signs, xerox machine instructions, the library catalog, the library cards, the brochures, the use policies, etc., IS NOT. (Your deflect and redirect debate tactics are growin tiresome).