This series contains publications, correspondence, photographs, clippings, and other material regarding varieties of shade trees, cacti, and flowers studied and researched by Archibald D. Shamel. Topics include a chronology of historic trees in California and Mexico as well as advice about the care of trees. Descriptions and images of mutations are also included.

This series contains clippings, photographs, and other material regarding the history of California. The bulk of the material focuses on the city of Riverside and surrounding areas, pertaining to topics such as historic Riverside homes and the Riverside Beautification Committee. Photographs of Mecca, California and Palm Springs, California are also included.