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Daguerreotype Pictures for the Stereoscope - p227
doi:10.1038/scientificamerican03291856-227a
Henry Cort, the Inventor of Grooved Rollers and the Puddling of Iron - p228
doi:10.1038/scientificamerican03291856-228
Five Reasons Against the Extension of the Woodworth Patent.—Letter from Constituents to a Member of Congress - p229
doi:10.1038/scientificamerican03291856-229
Propositions for Testing Engines and Boilers - p229
doi:10.1038/scientificamerican03291856-229c
American Association for the Advancement of Science - p230
doi:10.1038/scientificamerican03291856-230b
