The United States National Arboretum
By: prepared by Agricultural Research Service
Edition: Rev. May 1986; slightly rev. Mar. 1989
Series: Program aid -- no. 309; Program aid (United States. Department of Agriculture) -- no. 309.
Publisher: U.S. Dept. of Agriculture
Published: 1989
Place of publication: Washington, D.C
Language: eng
Subjects: National Arboretum (U.S.); Arboretums