Manuscript Collections
Ryerson, Knowles A. (1892-1990). Papers.


Collection Number: D-011

72.4 linear feet
M.S., Horticulture, University of California, Berkeley (1923); Agricultural Extension Agent specializing in subtropical horticulture, at University of California, Berkeley and Davis; Researcher, USDA and Bureau of Plant Industry; Assistant Dean, College of Agriculture, University of California, Davis (1937-1952).
Correspondence and minutes from various commissions, including the National Arboretum and the South Pacific Commission; subject files related to subtropical horticulture and international agriculture; correspondence to academic colleagues and friends.
Inclusive Dates
Plant Science
Additional Collection Information
Finding Aid on the Online Archive of California (
Many collections are stored offsite and need to be retrieved for your research visit. To begin the request process, researchers should e-mail at least seven business days before visiting. Please wait for confirmation that the collection is available before visiting.