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The Mechanical Theory of Forgetfulness

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Chloroform

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The New York Elevated Railway

Mineral Wool

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Buildings of the Paris Exposition of 1878

Stolp's Complete Gear Instrument

Mery's Weighing Scoop

Curious Blood Disks

By John Michels

Steam Syphon Pumps

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January 12, 1878

Help Us Reforest the Mississippi River Valley