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2. H.F. Walling. Walden Pond, close-up section (enlarged) of Walling’s Map of the Town of Concord, Middlesex County Mass. Surveyed by Authority of the Town (Boston: H.F. Walling, 1852). Legend reads: "White Pond & Walden Pond from Surveys by H.D. Thoreau, Civ. Engr."
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