I have been working through transcribing and translating my great-grandfather's Civil Guard records (via Spanish Language Stackexchange). So far we have processed 1902 through 1912.
In several records it referred to the Herrera Civil Guard office. My great-grandfather was posted there for a number of years.
Then, in 1912 he was assigned to Corcoya and I can't find any existing office. Google provides information about the current office (or rather, lack of it) but nothing about the history.
How can I learn about the history of the Guardia Civile Office in Corcoya, and its location when my great-grandfather was posted there during 1912? This would let me fill in more detail of my great-grandfather's life.