Rare early use of multiple lithographic plates in the printing process.
Rare map of Texas, the Southwest and Mexico, published by A.H. Dufour.
What distinguishes this map from all others of this period is that certain roads and cities have been printed in red, using a process which resulted in a second plate strike. The second strike highlights imporant roads and cities.
The map shows some of the first detailed reporting of Jedidiah Smith's explorations, and a number of the early western myths persist, especially near the Great Salt Lake.