Did not find a marriage record for Pedro Letepichia & Magdalena San Miguel. I did however, find this marriage record: April 30 1877, Manuel Patino age 21 of Morelos son of Severiano Patino and Clemencia Villareal married Maria Magdalena San Miguel age 15 daughter of Silvestre San Miguel and Maria del Refugio Martinez.
Also, according to records on familysearch.org Magdalena San Miguel was christened on 10-12-1862 at Nuestra Sra. de Guadalupe Catholic church in Piedras Negras, MX.
Again on familysearch found the marriage record of a "Magalina" San Miguel to Francisco de Leon, they were married 12-8-1887 in Eagle Pass,TX. For some reason this entry is not in the marriage book that I have.
This was likely the parish that the San Miguel family attended. Refugio San Miguel gave a great deal of his time and money to help build the church. It is quite possibly the reason they named the church Nuestra Sra. del Refugio. Baptism records from this parish are available on microfilm at your local family history center, no need to go all the way to Eagle Pass. I actually have one of these films on indefinite loan at my local branch and would be more than happy to check them for you when I have a chance.