“Twee duiven.” 1933. Woodcut on Japanese paper. Collection of the Joods Historisch Museum, Amsterdam. In the public domain in the United States because the artist has been dead over 70 years. via https://jck.nl/en/node/3038
“Oost-Indische kers” (East Indian cherry). 1919. Collection of the Gemeentemuseum, The Hague. In the public domain in the United States because the artist has been dead over 70 years. via https://commons.wikimedia.org/wiki/File:Oost-Indische_kers.jpg
“Swimming Frog.” Undated. Collection of the Rijksmuseum, Amsterdam. In the public domain. viahttp://clawmarks.tumblr.com/post/171358387412/zwemmende-kikker-julie-de-graag-c1887-1924