The United States National Arboretum, Washington, D.C.
Edition: Rev. July 1974.
Series: Program aid -- no. 309; Program aid (United States. Department of Agriculture) -- no. 309.
Publisher: U.S. Dept. of Agriculture
Published: 1974
Place of publication: Washington, D.C.]
Language: eng
Subjects: National Arboretum (U.S.)