Statistics for occurrence #1 of “Mr. Sweetser” in chapter 11 of Historic leaves, volume 3, April, 1904 - January, 1905:

...ho left its style of architecture as we now see it. Another teacher of this period was Robert Calley, but we are at a loss just when to place him. He may have acted as substitute or assistant for Mr. Sweetser during the last years of that gentleman's career. We are indebted to Wyman for our account of him. He was the son of Robert and Lydia (Stimpson) Calley, and was born in Charlestown June 4, 1726. ...
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