A teacher demonstrates with the help of a model of a bridge in the United States.
United States USA Date:1923 Duration:31 sec Sound:NO SOUND
A demonstration in a classroom in the United States. A teacher with a model of a bridge made of wood. Two students next to the model of the bridge as the teacher demonstrates the bridge to the class. Opening partial slate reads, "Learning how Ceasar built the bridge that enabled his army to conquer the
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