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

...d Count Circourt was never weary of furthering my inquiries. My friend Mr. J. Romeyn Brodhead, was so kind as to make for me selections of papers in Holland, and I take leave to acknowledge, that Mr. J. A. de Zwaan of the Royal Archives at the Hague, was most zealous and unremitting in his efforts to render the researches undertaken for me, effective and complete. I have obtained so much of Spanish Correspo...
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