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Tunnel on the Baltimore and Ohio Railroad - p321
doi:10.1038/scientificamerican06291850-321a
New Machinery for Depurating Sugar and other Substances - p321
doi:10.1038/scientificamerican06291850-321b
Steamboat Accidents and the Bursting of Boilers - p323
doi:10.1038/scientificamerican06291850-323b
New Machine for Making Shoemakers'Jiggers - p324
doi:10.1038/scientificamerican06291850-324
Artificial Diamonds and the Washington Globe - p325
doi:10.1038/scientificamerican06291850-325a
Lights and Shade of Sense and Nonsense - pp325 - 326
doi:10.1038/scientificamerican06291850-325b
New Agents for the Scientific American - p327
doi:10.1038/scientificamerican06291850-327b
History of Propellers and Steam Navigation - p328
doi:10.1038/scientificamerican06291850-328b
Manufacture of the Chromate of Potash, Lead, and Lime - p328
doi:10.1038/scientificamerican06291850-328c
