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Types of Fir Trees with Identification Guide and Pictures - Leafy …
Conifer Identification Guide: Pine, Fir, and Spruce (With Pictures)
Fir - Wikipedia
The Best Pine, Fir, and Spruce Identification Guide - Gardener's Path
Conifer cone - Wikipedia
Douglas Fir Identification: A Complete Guide - Evergreen Adventures
How to Identify 8 Common North American Fir Trees - Treehugger
The Essential Guide to Conifer Cones: Anatomy, Types, and …
How to identify conifer cones: colour, shape and size
Coast Douglas-fir - U.S. National Park Service