After taking the big rig tour, students and teachers can visit these sites for additional information and enrichment.

Desert USA has a website full of information about the Southwest, including the Casa Grande ruins and Hohokam culture.

Climate Change and Land Use in the Southwest U.S. - This site will assist teachers in finding information about the relationship between climate and population in the Southwest.

For information about the Sun Cities area in Arizona, check out Sun City AZ Visitors Center.

The official Hoover Dam website provides a complete history of the engineering spectacle, with photos from the past and the present. PBS also has an outstanding site about the Hoover Dam, including facts, maps, a timeline, and a discussion on the environmental impact of the dam.

For information about the Grand Canyon on the Web, the Grand Canyon National Park website should be your first stop. Using the online visitor's center, students can learn about the natural resources and geography of the natural wonder and also view hiking photos. Thegrandcanyon.com and thecanyon.com are two additional commercial sites with a variety of information. PBS also has a historic site called Lost in the Grand Canyon, detailing the exploration of the canyon in 1869.

The Carlsbad Caverns National Park website contains a variety of information about the nation's deepest limestone cave. The natural resources of the caves are highlighted, including the bats.

The New Frontier from Time magazine details life along the Mexican border between El Paso, Texas, and Juarez, Mexico. The site deals with economy, trade, culture, and politics, and is full of pictures and video resources. PBS also has an excellent site about The Border, with historical information, contemporary stories, and an idea exchange.

The Alamo de Parras is an awesome site about the history of the Alamo, including history about the battle and the building. The site features history of the early Spanish/Mexican military.  There is a significant section on Alamo archaeology and a wealth of primary sources.

For information on the state government of Texas, try the official website of Texas. The site contains information about businesses, education, culture, and state government departments.

The Harper's Weekly article on the Oklahoma Land Rush of 1899 gives a contemporary view of the run for land, including primary source quotations and pen and ink drawings.