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A first course in analytical geometry (1905)
Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 326
The Hiiperboloid of two sheets, ~ — ^- — ~= 1.a^ b- e2 SUKFACES OF REVOLUTION 309 … Fig.168. The Elliptic Paraboloid, ^ + r a2 b-Geometry, Analytic
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