The United States National Arboretum, Washington D.C.
Edition: Rev. May 1970.
Series: PA -- 309; Program aid (United States. Department of Agriculture) -- no. 309.
Publisher: U.S. Dept. of Agriculture
Published: 1970
Place of publication: Washington, D.C
Language: eng
Subjects: National Arboretum (U.S.); Arboretums
Other titles: United States National Arboretum; National Arboretum