The California Avocado Exchange was formally established in January 1924 to handle cooperative marketing of avocados, in much the same manner as Sunkist and the Walnut Grower’s Exchange; its name was changed to Calavo Growers of California in 1927. William McPherson was a charter member of the Exchange, and served as secretary of District 3 of the cooperative in the early 1930s. The materials in this subseries consist primarily of printed materials, including annual reports and newsletters. Other materials include records of fruit received from exchange members, 1924; Board of Directors minutes, 1929; and advertisements and publicity, circa 1925-1940.