Statistics for occurrence #1 of “Mr. Brooks” in chapter 1 of Historic leaves, volume 1, April, 1902 - January, 1903:

...ut boys, as a rule, won't look at a book that is intended for girls. I have now as many as fifteen books in my mind which I hope in time to write. Since this remark, made nearly seven years ago, Mr. Brooks has completed about a score of books. One of his most popular volumes, The Century Book for Young Americans, an extremely readable book on the American government, which was issued a few years ag...
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