The United States National Arboretum, Washington, D.C.
Edition: Rev. [ed.]
Series: PA -- 309; Program aid (United States. Department of Agriculture) -- no. 309.
Publisher: U.S. Dept. of Agriculture
Published: 1960
Place of publication: Washington, D.C.]
Language: eng
Subjects: National Arboretum (U.S.); Arboretums
Other titles: National Arboretum
Notes: "Slightly revised April 1960"--Page [8].