If you are researching South Texas ancestors or for a matter of fact just Texas ancestors you have to check out the Portal to Texas History it is unique and very informative. This website has digital newspapers, newsletters, genealogical journals, maps, and much more about Texas.
Screen shot of Website:
The Texas Portal to Texas History
The Portal is a gateway to Texas history materials. You may discover anything from an ancestor’s picture in a college yearbook to a rare historical map. – http://texashistory.unt.edu/
Just by the short time I have used it it has become a great tool in my family search, I already found several great stories in the Brownsville Herald, a South Texas Newspaper.
I can assure you that this website will become part of your tool box when researching family in Texas. Let me know in the comments section if this website was useful to you.