Azaleas and rhododendrons at the National Arboretum
Edition: [Rev. Jan. 1974]
Series: Program aid ; no. 491; Program aid (United States. Dept. of Agriculture) -- no. 491
Publisher: Dept. of Agriculture, Agricultural Research Service
Published: 1974
Place of publication: [Washington]
Language: eng
Subjects: Azaleas; Rhododendrons; National Arboretum (U.S.)