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Facts for the Public—The Scientific American - p26
doi:10.1038/scientificamerican10161847-26k
Plumbe's and Whitney's Projects for a Rail Road to the Pacific - p27
doi:10.1038/scientificamerican10161847-27a
Smith's Rotary Engine—Vertical Sectional View - p28
doi:10.1038/scientificamerican10161847-28i
To Obtain Heights which Cannot be measured - p32
doi:10.1038/scientificamerican10161847-32c