1 “... and steel industry, Philadelphia shipbuilders negotiated the transition from wooden to iron hull...”

2 Subjects: “...Philadelphia...”

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5 “... in cities such as Boston, Chicago, Los Angeles, New York, and Philadelphia, as well as in many other centers...”

6 “... to Philadelphia. There, equipped with resources for experimental development that were extraordinary...”

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9 “..., New York, Philadelphia, Baltimore, and New Orleans. This is a significant volume for readers...”

10 “... at the moment that the federal Constitution was being drafted at the Philadelphia Convention. It made some sense...”

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12 “... York, Chicago, Boston, Philadelphia, St....”