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Address of the Governor of San Luis Potosi to the Mexican People - p234
doi:10.1038/scientificamerican04171847-234r
An Improvement in the Electric Telegraph - p236
doi:10.1038/scientificamerican04171847-236j
Great Iron Bridge for the Neva, Built at Liverpool - p237
doi:10.1038/scientificamerican04171847-237c
Blanchard's Lathe for Turning Irregular Forms - p240
doi:10.1038/scientificamerican04171847-240f