Scope and Contents From the Sub-Series: 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....