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Armored vessels. --- Artillery. --- Coast defenses. --- Armed Forces --- Iron industry and trade. --- Steel industry and trade. --- Iron. --- Metallurgy. --- Military readiness. --- Strategy. --- Military research. --- Technology. --- Navy-yards and naval stations. --- Naval research. --- Shipbuilding. --- Steamboats. --- Warships. --- Appropriations and expenditures. --- United States --- Armed Forces --- Appropriations and expenditures.