2006
National Gallery of Art, 1991
National Gallery of Art, 1939
National Gallery of Art, 1940
National Gallery of Art, 1949
National Gallery of Art, 1960
National Gallery of Art, 1700
National Gallery of Art, 1866
National Gallery of Art, 1936
National Gallery of Art, 1894
National Gallery of Art, 1971
National Gallery of Art, 1937
National Gallery of Art, 2000
![Green Angel [trial proof]](https://api.nga.gov/iiif/57aeb9cc-f348-4d84-b7c9-716a080f31ff/full/843,/0/default.jpg)
![Over the River, Project for the Arkansas River, Colorado [top panel]](https://api.nga.gov/iiif/a265092c-7906-4e41-864f-6132f25bd385/full/843,/0/default.jpg)