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| Aerial view of the Rio Grande looking north just above (upstream) from the Polvo site. Modern irrigation allows the mechanized cultivation of the wide floodplain on the left in Mexico as well as narrower terraces on the U.S. side of the river. Prior to modern times, farming would have been restricted to much smaller, low-lying areas adjacent to the river where natural irrigation was possible. 1983 photo by Bob Parvin, courtesy Texas Historical Commission. |