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المؤلفون: <a href='https://dar.bibalex.org/ar/Search/ExactResults.aspx?format_Id=1&author=Bovey%2C%20Henry%20T.'> Bovey, Henry T.
المساهمون: <a href='https://dar.bibalex.org/ar/Contributor/ContributorItems.aspx?contributor=Biodiversity%20Heritage%20Library&format_id=1'> Biodiversity Heritage Library
المجموعات: <a href='https://dar.bibalex.org/ar/Collection/CollectionItems.aspx?collection=Biodiversity%20Heritage%20Library&format_id=1'> Biodiversity Heritage Library
التصنيف: <a href='https://dar.bibalex.org/ar/Category/CategoryDetails.aspx?mainCat=Others&format_id=1'> Others
الموضوعات: Trees ,&nbsp; Strength of materials

The strength of Canadian Douglas fir, red pine, white pine, and spruce.