00932cam a2200277 4500 agr68000252 DLC 20260227111031.0 691103s1968 dcua 000 0 eng c agr68000252 U.S. Nat'l Agr. Libr. DLC DLC n-us--- S21 .A856 no. 879 1 Ag84Pro no. 879 National Arboretum (U.S.) Fern Valley trail, the National Arboretum. [Washington, U.S. Govt. Print. Off., 1968] 8 p. illus. 24 cm. United States. Dept. of Agriculture. PA- 879 Ferns United States. National Arboretum (U.S.) Ferns United States. United States. National Arboretum. Program aid (United States. Department of Agriculture) ; no. 879. United States. Department of Agriculture. PA- 879. 12547 12547