Research in San Luis Potosi

Greetings to all. I am learning quite a bit from these postings…general information such as the whys of dispensas and social classifications. Thanks to everyone.

My main area of research is Zacatecas, however, is there anyone doing research in San Luis Potosi who can offer suggestions. Names: Alvarado, Galvan, Rodriguez, Soto, Garcia, Ybarra, Lozano, Mireles. My trail ends with Calistro Alvarado born abt 1763, married to Geronima Mireles .

Places: Matehuala, La Morita or La Mesita, Piotillo, Rancho de la Viuda, Encarnacion. And for Lozano, I have a mention of place of birth as Boca de Caballeros (city of San Luis Potosi) a place I cannot identify.
Any suggestions, leads, or direction as to where I can research will be greatly appreciated.

Any comments on the Alvarados, where they originated, who came and when, etc.

Thanks - Anita