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On economic curves / Pierre Samuel Du Pont de Nemours ; a letter reproduced in English translation with the original diagram and an introduction by Henry W. Spiegel. -- Baltimore : Johns Hopkins Press , 1955. -- vi, 17 p. : ill. ; 23 cm. -- (A reprint of economic tracts / edited by Jacob H. Hollander). -- (BA2606955X) ; https://ci.nii.ac.jp/ncid/BA2606955X
Author Heading(s): Du Pont de Nemours, Pierre Samuel ; Spiegel, Henry William. -- Classification(s): DC18 : 330.152
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