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For more than three decades, Elsa Dorfman has managed to make one of the world’s most unwieldy cameras, and one of the rarest — a 20-inch-by-24-inch Polaroid — into an instrument of such warmth, intimacy and latter-day bohemian spirit that her work has made her into a kind of folk hero in Cambridge, Mass. This is a 1987 mother-and-daughters portrait of the Boteins.