Azaleas and rhododendrons at the National Arboretum
Series: Program aid -- no. 491; Program aid (United States. Department of Agriculture) -- no. 491.
Publisher: U.S. Dept. of Agriculture
Published: 1962
Place of publication: [Washington, D.C.]
Language: eng
Subjects: Azaleas; Rhododendrons; National Arboretum (U.S.)
Notes: "Issued April 1962."