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Letter from the Secretary of the Navy—The French Exhibition - p98
doi:10.1038/scientificamerican12091854-98a
Treatment of Lead, Silver, and Copper Ore - p99
doi:10.1038/scientificamerican12091854-99
Floating Batteries for the Baltic—Shot-Proof Iron Plates - p99
doi:10.1038/scientificamerican12091854-99c
Preparation of Indigo in Central America - p104
doi:10.1038/scientificamerican12091854-104a
