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Pocket-book of mechanics and engineering (1864)
Nystrom, John W. (John William), 1824-1885 · Philadelphia, J.B. Lippincott · leaf 158
151. Ellipse. \/^G) Conic Sections. 143 … 152. Ellipse. e = jrrf — n*,2n* 153. Ellipse.Mechanical engineering · Engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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