Series 1. Academic career 1925-1955, undated
Typescript titled "Lecture on Tropical Fruit" by Dean Merrill 1925.
Research papers written by colleagues and students regarding horticulture 1944-1950.
Lecture notes from Horticulture 102 class 1950-1952.
Lecture notes from Horticulture 102 class 1953-1954.
Examinations from Horticulture 102 class 1951-1954.
Photographs and negatives of Horticulture 102 class field trip to San Diego, California 1946.
Correspondence of Frederick F. Halma regarding his retirement 1954-1955.
Photographs and negatives of cherimoya fruit, kei apples and pistachio trees 1938-1940.
Press clipping from the California Citrograph (August 1954) regarding the retirement of Frederick F. Halma 1954.
Lantern slides of cherimoya fruit undated.
Series 2. Citrus research and industry 1919-1956, undated
Documents written by Frederick F. Halma to the Dean about research projects, expenses, and World War II activities 1944-1954.
Annual reports and summaries regarding citrus projects and experiments conducted by Frederick F. Halma 1926-1932.
Annual reports and summaries regarding citrus projects and experiments conducted by Frederick F. Halma 1933-1954.
Correspondence between Frederick F. Halma, citrus growers, and colleagues regarding citrus projects and citrus plots 1950-1956.
Research conducted by Frederick F. Halma regarding citrus fruit and trees 1952-1954, undated.
Press clippings regarding Frederick F. Halma and his citrus research 1945-1946, undated.
Publications written by Frederick F. Halma regarding citrus research and the citrus industry. Includes a numbered bibliography that lists both citrus and avocado publications in chronological order (Note: avocado publications are located in Series 3) 1919-1929.
Publications written by Frederick F. Halma regarding citrus research and the citrus industry 1931-1941.
Publications written by Frederick F. Halma regarding citrus research and the citrus industry 1942-1952.
Project files regarding Citrus Project 193-D, a comparative study of oranges and lemons propagated by cuttings and budding 1933-1937, undated.
Project files regarding the J.W. Wing plot of citrus trees that were part of Citrus Project 193-D 1933-1946, undated.
Project files regarding the Citrus Experiment Station S1, Block C Plot of citrus trees that were part of Citrus Project 193-D 1932-1952.
Press clippings and correspondence regarding an orange tree that Frederick F. Halma donated to the City of Riverside that was produced from the cuttings of the Riverside Parent Navel Orange Tree. Includes press clippings about Eliza Tibbets and the origins of the Riverside Parent Navel Orange Tree 1934-1936.
Photographs and negatives of white sapote fruit and of wooden frames built around orange trees where soil temperatures were recorded 1938-1940.
Photographs of an unidentified citrus experiment station undated.
Photographs of the 1928 St. Francis Dam disaster that occurred near Santa Clarita, California 1928.
Series 3. Avocado research and industry 1937-1963
Report (1943-1953) on the progress and findings of Frederick F. Halma's avocado rootstock experiments 1953.
Documents regarding avocado rootstock trials conducted in California by Frederick F. Halma 1944-1953.
Annual reports and summaries regarding avocado rootstock investigations 1945-1963.
Documents and correspondence regarding avocado rootstock investigations and the avocado plots/trees involved in the investigations 1944-1961.
Documents regarding the California avocado plots involved in avocado rootstock investigations, trials, and experiments 1948-1953.
Project files regarding an avocado variety project conducted by Frederick F. Halma 1949-1954.
Documents and photographs regarding the effect of low temperatures on avocado trees during the freeze of January 1937 1937-1939.
Publications written by Frederick F. Halma regarding avocado research and the avocado industry. Includes a numbered bibliography that lists both citrus and avocado publications in chronological order (Note: citrus publications are located in Series 2) 1937-1952.
Press clippings about Frederick F. Halma and his avocado research 1948-1949.
Photographs and negatives of avocado fruit, avocado trees, and of Frederick F. Halma and his wife working with young avocado trees 1940-1954.