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Features

The Second Refrigeration Congress

Sea Strength of Principal Naval Powers

Agriculture the Basis of Prosperity

Engineering

Science

Electrical

The Reclamation of the Arid Lands of the West

The Wonderful Iron Mines of Lake Superior--How the Ore is Mined and Carried in Bulk

The Proposed Lakes-to-the-Gulf Deep Waterway

Another Magic Square

American Harvesting Machinery--The Birth and Growth of a Vast Industry

Gary: The Largest and Most Modern Steel Works in Existence

The Handling and Storage of our Huge Grain Crop

Chicago and the Railroad System of the Middle West

Iron That Will Not Rust

Chicago's Sixty Miles of Freight Subway

Departments

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    Correspondence

  • New Books, Etc.

  • Recently Patented Inventions

  • Index of Inventions

  • Patents

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December 11, 1909

Help Us Reforest the Mississippi River Valley