Interactive Trail Map Online: https://southern-trails.org/trail-map/newtrailmap
Southern Route Trails to California, 1175-1857: southerntrail2008
The Southern Trail: Santa Fe to San Diego and Los Angeles: southerntrail2009
The Southern Trail to California. Map by Tom Jonas: southerntrail2010
Butterfield Overland National Historic Trail Map
Travelers on the California Leg of the Southern Route 1849 – 1852