Autograph Letter Signed ‘Amand König, Libraire’, to Monsieur Guettard of the Royal Academy in Paris (probably Jean Etienne Guettard, 1715-1768, botanist) about the packet sent to him through Monsieur Lavoisier, the difficulty in completing this set of books in Germany, and recommending his own book catalogue. In French. 1 page 8 x 6 inches, upper right corner singed (with loss of a few letters), address panel on verso, with a typed English translation. Undated. Amand König, bookseller of Strasbourg in the second half of the eighteenth century.