His Observations sur l'operation du remboursement au pair, 1838: t.p. (Gustave d'Eichthal)
NUC pre-56 (Eichthal, Gustave d', 1804-1886)
Wikipedia 11 October 2020: (Gustave Séligmann d'Eichthal (March 3, 1804, Nancy, Meurthe-et-Moselle ; April 9, 1886, Paris) was a French writer, publicist, and Hellenist.) https://en.wikipedia.org/wiki/Gustave_d'Eichthal