The way in which the trunk is cut is determinant to establish the functionality and final characteristics of each board.
Douglas Fir The Wood Database (Softwood)
About Douglas Fir - Tree Identification, Properties & Uses - Softwood Species
Best of the visualisation web May 2018 - Visualising Data
Wood, Tag (page 15)
Choosing the Right Wood for Your Laser Cutting or Engraving Project
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The Nature of Wood -- Wood Grain
Five Common Pruning Mistakes, and How to Fix Them - FineGardening
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Black Locust The Wood Database (Hardwood)
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How Tree Trunks Are Cut to Produce Wood With Different Appearances and Uses
Black Walnut Tree: Benefits, Problems, and Identification