Statistics for occurrence #1 of “Philadelphia, Pa.” in alphabetic letter N, entry group 1, entry navigation-acts of Harper's Encyclopedia of United States History:
...ion laws of the United States, and the development of the ship-building industry under them, is contributed by Charles H. Cramp, president of the Cramp & Sons Ship and Engine Building Company, of Philadelphia, Pa.
When one traces the history of the navigation laws of the United States, beginning with the act of Dec. 31, 1792, which closed American registry to foreignbuilt vessels except as to prizes take...
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