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Fir - Wikipedia
Fir | Description, Uses, & Species | Britannica
Fir Tree Facts, Types, Identification, Diseases, Pictures
How to Identify 8 Common North American Fir Trees - Treehugger
Fir Definition & Meaning - Merriam-Webster
Types of Fir Trees with Identification Guide and Pictures - Leafy …
Douglas fir | Description, Uses, & Species | Britannica
Conifer Identification Guide: Pine, Fir, and Spruce (With Pictures)
Fir Tree Guide: Description, Types, Growing and Care Tips
White fir | The Morton Arboretum