Fern Valley trail, the National Arboretum.
Series: Program aid (United States. Dept. of Agriculture) ;; no. 879.
Publisher: U.S. Govt. Print. Off.
Published: 1968
Place of publication: [Washington
Language: eng
Subjects: National Arboretum (U.S.); United States. National Arboretum.; Ferns -- United States.; Ferns -- United States.