Gay,

What is UDS? I documented my Spanish-French ancestor (Chavana) who came to Nacogdoches in 1789 from Mexico and married a girl from the Sanchez family who were natives of Adaes and original settlers with Ybaro in Nacogdoches. I got my First Families of Texas Certificate from the Texas State Genealogical Society (see their website www.rootsweb.com/~txsgs/) but didn't think it was a good idea to join DRT since some of this family's members were put on trial for treason for joining the Cordova Rebellion against the Texas Republic. When I documented my line I used the 3 volume work Residents of Texas and the corresponding Spanish originals of the Nacogdoches censuses from the microfilms of the Bexar archives plus a Nacogdoches county court record.
I found the Blake Collection at S. F. Austin University's East Texas Research Center very helpful because they have a card index listing of all surnames in the collection. For those who are not familar with the Blake Collection or ETRC go to the website libweb.sfasu.edu/proser/etrc/
I've not come across the surnames of Garcia, etc. in my research so far but I'll keep a look out. The families I am interested in East Texas are Chavana, Sepulveda, Gonzalez and Sanchez (with various spellings). In researching Spanish-French lines it is important to remember that many people changed their names to more anglo versions after the Texas Revolution. I have a friend whose surname Rivers was from Del Rio or Los Rios. (Her husband calls us "closet Mexicans".)

Janet K