California Arboretum Foundation, 1951-1976
Los Angeles State and County Arboretum, 1950 - 1972
Los Angeles State and County Arboretum, 1953 - 1964
California Arboretum Foundation, 1955-1960
Los Angeles (Calif.) Department of Arboreta and Botanic Gardens, 1959-1990
California Arboretum Foundation, 1960-1969
Los Angeles County, Public Services Division, 1972 - 1975
California Arboretum Foundation, 1974-1975
Garden Society, 1977-1988
California Arboretum Foundation, 1982-1983
California Arboretum Foundation, 1984-1986
California Arboretum Foundation, 1988-1991
Los Angeles County Department of Arboreta and Botanic Gardens, 1989-1992
California Arboretum Foundation, 1992
California Arboretum Foundation, 1993-2000
Los Angeles Arboretum Foundation, 1993 - 2003
Los Angeles Arboretum Foundation, 2000 - 2003
Los Angeles Arboretum Foundation, 2000
California Arboretum Foundation, 2003
Los Angeles State and County Arboretum, 2001 - 2007
Los Angeles Arboretum Foundation, 2004 - 2005
Los Angeles Arboretum Foundation, 2005-2008
Los Angeles Arboretum Foundation, 2009 - 2012
Los Angeles Arboretum Foundation, 2011-
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