Statistics for occurrence #1 of “Dr. Cooper” in chapter 1 of George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 6, 10th edition.:

...prietaries of Pennsylvania and Deputy Governor Hamilton; between Cecil Calvert and Hugh Hammersley, successive Secretaries of Maryland, and Lieutenant Governor Sharpe; between Ex-Governor Pownall and Dr. Cooper of Boston; between Hollis and Mayhew and Andrew Eliot of Boston. Of all these I have copies. Of the letter-books and drafts of letters of men in office, I had access to those of Bernard for a s...
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