The William Mason photographs of Little Tokyo, Los Angeles comprise approximately 500 negatives and 162 photographic prints showing the streets and people of Little Tokyo between 1963 and 1968. Almost every print has a penciled caption by the photographer on the back, often specifying the exact location (including cross streets) of each shot along with the names of people photographed. A small number of the photographs in this collection picture parts of Los Angeles outside of Little Tokyo, such as Echo Park, "Bel Air Museum," and Elysian Park.