Cornerstone Map of the Texas Republic28 by 31 inches framed. This replica of the rare antique map published in London by John Arrowsmith, is one of the cornerstones of any Texas map collection. This map accurately reflects the western border of Texas as being the Rio Grande River to its source, a claim established by the treaty signed by Santa Anna after his defeat at the battle of San Jacinto. At the time of publication these maps reflected the cutting edge of information about the