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1Published 1900Subjects: “...Allegheny Arsenal (Pittsburgh, Pa.)...”
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2Published 1833“...Steamboat navigation between Pittsburgh and Brownsville. Survey of Monongahela river with view to...”
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3Published 1832“... to Pittsburgh, survey for...”
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5Published 1835“..., and Maryland, to Pittsburgh and other posts in western country...”
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6Published 1899“...Survey of Ohio River from Marietta to Pittsburgh...”
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