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Knitting in the Library (recto), c. 1881. In this working drawing for the softground etching and aquatint of the same title, Cassatt portrays her mother in a quiet moment of concentration with
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Elements of geometry and trigonometry . BOOK IV. 99 PROBLEM II.. To find a fourth proportional to three gioen lines, A, B, C. Draw the two indefi-nite lines DE, DF, form-ing any
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