1930–1940
National Gallery of Art, 1966
National Gallery of Art, 1937
National Gallery of Art, 1939
National Gallery of Art, 1912
National Gallery of Art, 2007
National Gallery of Art, 1884
National Gallery of Art, 1743
National Gallery of Art, 1954
National Gallery of Art, 1920
National Gallery of Art, 1935
National Gallery of Art, 1803
![Light Bulb [trial proof]](https://api.nga.gov/iiif/a1ce4bf2-19ba-4958-bc9e-0a5eb9272185/full/843,/0/default.jpg)
![Paar, Mann mit Zither (Couple, Man Plays a Zithar) Conversing [p. 9]](https://api.nga.gov/iiif/ce14ea6f-8876-419e-b37c-1b463313616b/full/843,/0/default.jpg)
![Seated Angel in a Landscape [recto]](https://api.nga.gov/iiif/00f875e7-2af4-4292-8cdb-0db2a2a72bf2/full/843,/0/default.jpg)
