"Ferns Canada." . . "United States." . . "Ferns United States." . . . . . "The fern lover's companion a guide for the Northeastern States and Canada"@en . "The fern lover's companion a guide for the Northeastern states and Canada"@en . . . . . . . . . "The fern lover's companion : a guide for the Northeastern states and Canada"@en . . . . "The Fern Lover's Companion A Guide for the Northeastern States and Canada"@en . . . . . . . . "The fern lover's companion; a guide for the Northeastern states and Canada"@en . "The fern lover's companion; a guide for the Northeastern states and Canada" . . . "Ferns." . . "Canada." . .