The Tigua Indians were at Ysleta del Sur (El Paso). There are many records, books, etc...about these Indians at
University of Texas at El Paso - Library Special Collections
University of Texas at Austin (Center for American History)
You can also look at some available materials at their web sites.
Also, a great book about the Tigua's history is The Tigua Indians: Pueblo Indians of Texas
by Bill Wright.