books.google.com - The 2,000-mile-long international boundary between the United States and Mexico gives shape to a unique social, economic, and cultural entity. The U.S.-Mexican Border in the Twentieth Century is the first comprehensive treatment of the fascinating evolution of the region since the beginning of the twentieth...http://books.google.com/books/about/The_U_S_Mexican_Border_in_the_Twentieth.html?id=r94lE3ZW7MEC&q=northern&utm_source=gb-gplus-shareThe U.S.-Mexican Border in the Twentieth Century
