Smoky Hill Trail History
- Brief history of the Smoky Hill Trail.
- http://www.vlib.us/old_west/trails/shthist.html

Oregon-California Trails Association
- Nonprofit organization devoted to preserving and enjoying the history of the trails of the westward expansion used by 19th century pioneers. Site includes listings of trail sites, graves, maps, and facts; trail stories; and information about modern treks,
- http://octa-trails.org/

Web de Anza
- Provides visitors with documents and multimedia resources covering Juan Bautista de Anza's two overland expeditions from the Sonoran Desert to northern California.
- http://anza.uoregon.edu/

Southwest Explorations
- A study of the historical expeditions that opened Arizona and the American west.
- http://www.tomjonas.com/swex

The Beckwourth Trail
- Provides a history of the discovery and use of the trail found by the African-American explorer and trader James Beckwourth in 1850.
- http://132.241.182.52/PlumasNF/heritage/beckwpnf.htm

The Overland Trail
- Information on The Overland Trail, established in 1862 by Ben Holladay, it went from Julesburg, CO to Ham's Fork, WY.
- http://www.over-land.com/

Utah Crossroads Chapter - Oregon-California Trails Association
- Organization dedicated to preserving, studying, and marking the historic trails in Utah and other Western states, including the California Trail, Old Spanish Trail and Mormon Pioneer Trail.
- http://www.utahcrossroads.org/