Statistics for occurrence #1 of “Professor Longfellow” in chapter 1 of Historic leaves, volume 2, April, 1903 - January, 1904:

...ep possession of a small island, made worth fighting for by the presence of an old scow, altered into a feudal castle by rude carpentry and youthful imagination. On this fictional background appear Professor Longfellow of Harvard, as a summer visitor, and his friend Charles Sumner, both of whom advise the combatants, without interfering with them. Any boy should like this book. Again, read Historic Girls, or Hi...
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