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hankronThe 1870s Harper's were on paper similar to today's newspaper paper. Thin, fibery but not un-smooth. If the paper is white coated and super smooth, like today's Sports Illutrated paper or the 'illustrated plates' in an old book, it is probably from later.
There are a good number of 19th century newspaper and magazine baseball woodcuts that are uncataloged or rarely seen. After you've discovered the date of your woodcut, you will can be its official cataloguer.