Since you tell me that you're going to El Rosario BCN, I think you may find something interesting about this pueblo/town by going to the blog site of Ingeniero Alejandro Espinoza, this is the blog address: http://elrosariobc.blogspot.com
, try to get the post for "Familia Marron" from Enero 2010, also regarding Familia Pellejeros (Verdugo) in the post dated Septiembre 2011.
El Ing. Alejandro Espinoza wrote 2 books about El Rosario, on his blog you can download one of the books, the one titled: Los Rosareños ( https://www.box.com/shared/3714j14p1uyut2xzf8ig
I hope this information is helpful to you.
That's it. I email you this evening, after I am out of my work place.