This undated image provided by the Navajo Tourism Department shows visitors riding horseback at Monument Valley Navajo Tribal Park in northeastern Arizona. An economic impact study and yearlong survey... more 
This undated image provided by the Navajo Tourism Department shows visitors riding horseback at Monument Valley Navajo Tribal Park in northeastern Arizona. An economic impact study and yearlong survey show spending by tourists on the Navajo Nation has increased by nearly one-third since 2002. (AP Photo/Navajo Tourism Department, Roberta John) less 
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Associated Press | Photo By Navajo Tourism Department, Roberta John
Mon, Apr 2, 2012 10:18 AM EDT