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Pratt and Morse's Improved Railroad Brake - p313
doi:10.1038/scientificamerican06241848-313c
The New Orleans Telegraph Line via The Mississippi Valley - p313
doi:10.1038/scientificamerican06241848-313j
Selling an Invention before a Patent is Secured - p317
doi:10.1038/scientificamerican06241848-317
Cost of 1OOO “Ring” Spindles and Preparation - p317
doi:10.1038/scientificamerican06241848-317f
Collections of Specimens from Soundings - p318
doi:10.1038/scientificamerican06241848-318d