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  1. By: United States. Army. Corps of Engineers. - Ludlow, William, - United States. Army. Office of the Chief of Engineers. - United States. War Department.
    Publication info: Washington, D.C, Govt. Print. Off, 1876
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: United States. Army. Corps of Engineers. - Ludlow, William, - United States. Army. Office of the Chief of Engineers. - United States. War Department.
    Publication info: Washington, D.C, Govt. Print. Off, 1876
    Holding Institution: Cornell University Library