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inventors american

The making of America

By Robert M. La Follette

March of the iron men

By Roger Burlingame

The heroic age of American invention

By L. Sprague De Camp

American inventors

By Clarence J. Hylander

March of the iron men

By Roger Burlingame

Bahnbrechende Erfindungen in Amerika und Europa, Geschichte ihrer Entstehung und ihrer Schöpfer

By Waldemar Bernhard Kaempffert