1955–1956
National Gallery of Art, 1936
National Gallery of Art, 1817
National Gallery of Art, 1941
Frank, Robert, 1957
National Gallery of Art, 1937
National Gallery of Art, 1752
National Gallery of Art, 1694
National Gallery of Art, 1979
![3 Flags for 1 Space and 6 Regions [top left panel]](https://api.nga.gov/iiif/83fc7e02-1245-4a27-bf24-994556e73f38/full/843,/0/default.jpg)