Steel industry and trade -- History

This is am image of Pittsburgh, PA at the height of its fame as the Steel City of the United States. Item depicts tall smokestacks belch smoke into an overcast sky and the roofs of the factory buildings look like the frozen waves of some black ocean.

This is second printing a chart that originally appeared in 1953. The imagery is simple and easy-to-follow. The chart could be folded down to 8"x10" and is perforated on one edge for inserting into a ring-binder suggesting that it was designed for use in schools.