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In 1946, a man chopping wood in Oregon noticed several timber beetle larvae chewing through the logs around him.

Hyphenation and spelling are not uniform throughout this book, e.g., 'sapwood' and 'sap-wood' both occur; 'Columbian Timber-beetle' and 'Columbian timber beetle' occur in the same paragraph.

Work of the Columbian Timber Beetle: Black holes and "grease spots" in white oak.

Work of the Columbian Timber Beetle: "Steamboats" in quartered or Split white oak.

Among the borers which do most injury in destroying valuable timber are the hickory-bark beetle, the bark-boring grubs which kill oak, chestnut, birch and poplar trees, the locust borer, the chestnut timber-worm and the Columbian timber beetle.