@book {johnson_hugues-adrien_1988, title = {Hugues-Adrien Joly garde du Cabinet des Estampes de la Biblioth{\`e}que nationale. Lettres {\`a} Karl Henrich von Heinecken, 1772-1789}, year = {1988}, publisher = {Biblioth{\`e}que nationale}, organization = {Biblioth{\`e}que nationale}, address = {Paris}, author = {William McAllister Johnson} }