Works Cited

Anderson, Peter. A Grand Canyon Journey. United States of America: Simultaneously in Canada, 1997. 

Arnold, Caroline. Stories In Stone. New York: Clarion Books, 1996. 

"The Big Dig." Weekly Reader News- Senior 18 Jan. 2008: 2. 

Meilach, Dona Z. "Petroglyphs." Arts & Activities 19 Jan. 1998: 43-46. 

Orrin, Shane. "Stonehenge." Stonehenge Oct. 2007: 1. 

Petroglyphs.us. 2008. 3 Mar. 2008 <http://www.petrogplyphs.us>. 

Stewart, Robert. Mysteries of History. Washington D.C.: National Geographic Society, 2003. 

"Stonehenge and the Rings of Rocks." The Museum of Unnatural Mystery. 2006. none. 3 Mar. 2008

     <http://www.themuseumofunnaturalmystery.com/stonehengeandtheringsofrock/>. 

Wuethner, George. wikipedia. 28 Feb. 2008. 11 Mar. 2008 <http://grandcanyon/wiki/wikimedia>. 

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