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davidcyclebackLew Lipset's Encylopedia of Baseball Cards (1800s part) lists them.
To be technical, it's wood-engraving, not engraving. The two have a similar final look but are different in how they are made. You can also call the Harper's prints woodcuts, as wood-engraving is a type of woodcut.
Famous artists like Durer and Picasso made both engraving and woodcut prints, so both techniques were part of the standard repertoire.
Both printing techniques take great technical skill and the designs were created onto the plate by hand.