400 1 _
‡a
Du Pont de Nemours, Pierre Samuel,
‡d
1739-1817.
‡t
On economic curves : a letter
400 1 _
‡a
Du Pont de Nemours, Pierre Samuel,
‡d
1739-1817.
‡t
On economic curves : a letter reproduced in English translation with the original diagram and an introduction by Henry W. Spiegel
400 1 _
‡a
Du Pont de Nemours, Pierre Samuel,
‡d
1739-1817.
‡t
On economic curves : a letter reproduced in English translation with the original diagram, and an introduction by H.W. Spiegel