Does anyone know of any archives that contains information of Correo Maritomo?

Does anyone know of any archives that contains information of Correo Maritomo?

There is some in the PARS website. But that topic is new to me as I ran across it by chance when I browsed archives in the PARS website.

I think it has to do with transporation of mail from Spain to the colonies and the mainland in Mexico. I wonder if there is some kind of registry or archive of that and the routes or how or where the mail was distributed in Zacatecas, Jalisco, Aguascalientes.