The collection consists mainly of the original correspondence (1839-1869) to and from José Matías Moreno, with the bulk of it coming in the 1850s and 1860s when Moreno was an important agent, merchant, and political figure in San Diego and Baja California. There is also some later material dealing with the subsequent history of his Rancho Guadalupe in northern Baja California.

In order to quote from, publish, or reproduce any of the manuscripts or visual materials, researchers must obtain formal permission from the office of the Library Director. In most instances, permission is given by the Huntington as owner of the physical property rights only, and researchers must also obtain permission from the holder of the literary rights In some instances, the Huntington owns the literary rights, as well as the physical property rights. Researchers may contact the appropriate curator for further information.

Collection is open to qualified researches by prior application through the Reader Services Department. For more information please go to following URL.