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ספרים בחינם

Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171

Herbert M. (Herbert Michael) Wilson · 2006

ספרייה ציבורית, Project Gutenberg. בלי הרשמה.

FuelCivil engineering -- PeriodicalsCoal mines and mining -- Safety measuresBuilding materials