The United States National Arboretum
By: prepared by Science and Education Administration
Edition: Rev. [ed.]
Series: Program aid -- 309; Program aid (United States. Department of Agriculture) -- no. 309.
Publisher: U.S. Dept. of Agriculture
Published: 1980
Place of publication: Washington, D.C.]
Language: eng
Subjects: National Arboretum (U.S.); Arboretums
Notes: "Revised May 1980."