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The Effect of City Atmosphere upon Stone - p243
doi:10.1038/scientificamerican04221848-243c
Rotary Engine Propelled by Explosive Gases - p244
doi:10.1038/scientificamerican04221848-244
The Bridge over the Ohio at Wheeling, Virginia - p246
doi:10.1038/scientificamerican04221848-246b
To Distinguish Steel from Iron, and to Soften and Color Steel - p248
doi:10.1038/scientificamerican04221848-248
Painting Top Rollers for Spinning Mules, Frames, Speeders. &C - p248
doi:10.1038/scientificamerican04221848-248c