Maps play an important role when it come to Mexican genealogical research. They help us identify long gone haciendas, towns, and even cities, as is the case with Guerrero (Revilla), Tamaulipas. Not to mention they also help us locate the ones whose name has been changed. There are some map collections out there to help us find old maps of Mexico, its states, and cities.
One of these such collections is the Mapoteca Manuel Orozco y Berra. Manuel Orozco y Berra (June 8, 1816 – January 27, 1881) was a Mexican historian and a member of the Mexican Academy of Language. He was born and died in Mexico City. Some digital maps from his collection have been digitized and are available online on a website provided by the Secretary of Agricultura, Ganaderia, Desarrollo Rural, Pesca y Alimentacion.
The following is an image showing this website.
Here is the url to this resource:
Let me know in the comments of any maps that you find. Also let me know how it will be able to help you in your genealogy.