4o. Motive Powers--The Expansion of Gases versus that of Fluids. Improvement in Mowing Machines. INTERESTING SCHOOL STATISTICS. The Honey Trade. Men of Progress. History of Railroad Cars., scientific american, 1871-02-25
4o. Motive Powers--The Expansion of Gases versus that of Fluids. Improvement in Mowing Machines. INTERESTING SCHOOL STATISTICS. The Honey Trade. Men of Progress. History of Railroad Cars., scientific american, 1871-02-25
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