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![First Principles of Field-Fortification : Containing Concise and Familiar Precepts for the Construction, Attack, and Defence of Field-Works; ... by Ch [Hardcover]](/itemImage/2/6/1/1/2_5953209.jpg "First Principles of Field-Fortification : Containing Concise and Familiar Precepts for the Construction, Attack, and Defence of Field-Works; ... by Ch [Hardcover]")