The materials in this subseries comprise records of the Secretary of the California Avocado Association, founded in May 1915 as the California Ahuacate Association. They were passed to William McPherson, who served in this position in 1927/1928 - 1929/1930, by his predecessor. The bulk of the materials dates from the terms of office of R. Agnes McNally, of Altadena, who served 1920-1921, and of Karl M. Wagner, of Los Angeles, who served 1922-1924, and consists of correspondence (original letters received and carbon copies of letters sent) on membership and administrative matters, and with government agricultural researchers and officials in the United States and abroad. The files include a 1921 letter from Schmidt Lithograph Company with samples of fruit crate labels, and several letters addressed to the secretary on matters not relating to avocados, such as the California Oriental Exclusion League (1920), and a letter from the Los Angeles Chamber of Commerce (also 1920) concerning the purchase of the Arcadia Balloon School, to establish an air training center. The subseries also contains several files of correspondence of the president of the Association, most notably William H. Sallmon, vice president, 1917/1918, and president, 1918/1919 - 1920/1921. Non-correspondence materials include a census of avocado growers, 1918-1920; board of directors minutes, 1922-1929; committee reports, 1924-1956; meetings, Avocado Days, and courses, 1916-1948; publicity materials, 1916-1925; 8 volumes of the Association’s Yearbook, 1930-1957; and a scrapbook, 1915-1916, from the formation of the California Avocado Association.