Quoting a letter from d'Eon de Beaumont and one from Baron d'Osten to him concerning d'Eon de Beaumont's Memoires pour servir à l'histoire générale des finances.
Higgs, H. Bibl. of economics 3250n
Microfilm. New Haven, Conn. : Research Publications, [1975]. 1 microfilm reel ; 35 mm. (Goldsmiths'-Kress library of economic literature ; no. 9588).