books.google.com - The liquid lifeline of an arid land, the Rio Grande has always been a vital presence in the American Southwest and Northern Mexico. A source of human sustenance for at least 15,000 years, the river has also been a site of conflict ever since exploring Spaniards first crossed its channel to colonize the...http://books.google.com/books/about/Rio_Grande.html?id=8P-szTvWDqQC&utm_source=gb-gplus-shareRio Grande
