Gray's manual of botany : a handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada - Gray, Asa 1810-1888; Rollins, Reed Clark 1911-1998; Fernald, Merritt Lyndon 1873-1950 (New York : American Book Company, 1908)
Keywords: BOTANICA -- ESTADOS UNIDOS; BOTANICA -- AMERICA DEL NORTE; BOTANICA -- CANADA