The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Art & Architecture Collection, The New York Public Library. "II Jahrgang (Liefr. I) 2. [Seven designs for jewelry, including necklace with pearls and diamonds with central flower shape.]" The New York Public Library Digital Collections. 1872 - 1873. https://digitalcollections.nypl.org/items/510d47e3-04d6-a3d9-e040-e00a18064a99