A list of archival repositories (with links) is available through the San Antonio Regional Archivists (SARA) at the following address:
A list of many Texas archival repositories can be found at the Texas Archival Resources Online (TARO) site.
A Few Archival Repositories outside of San Antonio
Finding Archival and other Primary Materials
St. Mary's University
Louis J. Blume Library
One Camino Santa Maria, San Antonio, TX 78228-8608