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The Underground and Elevated Electric Railway in Berlin—Now Completed and in Operation

By Frank C. Perkins

New Process for Ore Concentration

Russian and American Petroleum

Recent Progress in Large Gas Engines

The Block System

A Power Milk Separator

Researches on Argon and its Combinations

By M. Berthelet

Report of Bureau of Steam Engineering on Liquid Fuel for Naval Purposes

Post Office Statistics

Restorative Power

Apparatus for Short-Distance Stereoscopic Photography

Failure of Volapuk

The French First-Class Battleship “Gaulois.”

Some Practical Suggestions on Mosquito Extermination in New Jersey

By Henry Clay Weeks

The Lorenz Operation

The Forests of Russia

Reclaiming Swamps

Cotton Seed Rendered Immune

Distribution of Current at the Surface of Cathodes in Vacuum Tubes

By A. Wehnelt

What the United States of America is doing for Anthropology

South African Coal Fields

Trade Suggestions from United States Consuls

Selected Formulæ

Trade Notes and Recipes



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    November 08, 1902

    20% Sitewide for President's Day