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The Ratio of the Diameter to Its Circumference Is Exact - p219
doi:10.1038/scientificamerican03241855-219
Who Is the Inventor of Combined Stame and Steam in Engines - p221
doi:10.1038/scientificamerican03241855-221
The New Postage Law—Important to the Public - p222
doi:10.1038/scientificamerican03241855-222
The Fair of the Metropolitan Mechanics Institute - p224
doi:10.1038/scientificamerican03241855-224d
