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In Troubled Waters, Paul F. Paskoff offers a comprehensive examination of the federal government's river improvements program, which aimed to reduce hazards to navigation on the great rivers of America's interior during the early and mid-nineteenth century. Danger on the rivers came in a variety of forms. Shoals, rapids, ice, rocks, sandbars, and uprooted trees and submerged steamboat wrecks lodged in river beds were the most common perils and accounted for the largest number of steamboat disasters. This daunting array of river hazards required a similarly broad range of efforts to remove...