The California files (1941-2019) sub-series consists largely of research files, reprints, sketches, site survey reports, and correspondence pertaining to Fort Irwin, San Diego, Santa Barbara, San Bernardino, the Mojave Desert, and Joshua Tree National Park. The files also contain Warren’s research files on the San Dieguito and La Jolla complexes. Files from Warren’s work at California universities such as the University of California Santa Barbara (UCSB) and the University of California Los Angeles (UCLA) are included as well.