The first place I recall encountering the particulars of the square-cube law as related to dinosaurs was in Robert Bakker's book The Dinosaur Herises. As he pointed out, the total load support includes not only the bone itself but the various ligaments and other structures in the leg.

And I saw in this biweekly's Science News that a skeleton providing evidence of an avian breathing system in dinos has been found in So. America.

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If they can get you asking the wrong questions, they don't have to worry about the answers.