1999–2003
National Gallery of Art, 1940
National Gallery of Art, 1979
National Gallery of Art, 1944
National Gallery of Art, 1771
National Gallery of Art, 1900
National Gallery of Art, 1919
National Gallery of Art, 1936
National Gallery of Art, 1330
National Gallery of Art, 2005
National Gallery of Art, 1833
National Gallery of Art, 1987
![20 Foot Ladder for any Size Wall [VI]](https://api.nga.gov/iiif/fa41b90d-4545-40e5-9204-ff458a153b53/full/843,/0/default.jpg)
![Portrait of Wolfgang Frommel [p. 25]](https://api.nga.gov/iiif/2df969e9-ec3c-4874-b105-3b92c342d435/full/843,/0/default.jpg)
![The Seasons (Spring) [trial proof]](https://api.nga.gov/iiif/e94b97e0-937b-4441-8cb4-d5a238acb43a/full/843,/0/default.jpg)