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Cover Thomas B.F., Watt D.A. THE IMPROVEMENT OF RIVERS. A treatise on the methods employed for improving streams for open navigation, and for navigation by means of locks and dams Cover Thomas B.F., Watt D.A. THE IMPROVEMENT OF RIVERS. A treatise on the methods employed for improving streams for open navigation, and for navigation by means of locks and dams
Id: 155097
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(English).