Statistics for occurrence #1 of “Portland, Maine” in chapter 1.8 of Cambridge History of American Literature: volume 2:

..., whose appeared in 1830. Almost immediately after his graduation from Bowdoin College in 1818, Smith began to contribute a series of political articles in the New England dialect to the papers of Portland, Maine . These illustrated fairly well the peculiarities of New England speech and manners, and doubtless had a great influence in encouraging similar sketches in other parts of the country. Smith was in...
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