Reports on certain experimental and theoretical investigations relative to the quality, form, and combination of materials for defensive armor, together with incidental facts relative to their use for industrial purposes / made by the direction of bvt. maj. gen'l A. A. Humphreys, brig. gen'l and chief of engineers, U. S. A. by bvt. maj. W. R. King, capt. of engineers, U. S. A
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