Statistics for occurrence #1 of “Mr. Peters” in chapter 7 of Edward L. Pierce, Memoir and letters of Charles Sumner: volume 1:

...Mary added playful postscripts to the father's letter. Professor Greenleaf gratefully acknowledged his reports of his visit to Chancellor Kent and of life in Washington. One of the daughters of Mr. Peters thus describes him at this time:— It was somewhere about 1832 I think, in the summer-time, that Charles Sumner led me—then a little girl—and my father over Harvard Library; ...
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