1940
National Gallery of Art, 1936
United States Government, 1935
National Gallery of Art, 1937
National Gallery of Art, 1940
National Gallery of Art, 1521
United States Government, 1940
United States Government, 1937
National Gallery of Art, 1465
National Gallery of Art, 1490
National Gallery of Art, 1938
![The Mass of Saint Gregory [recto]](https://api.nga.gov/iiif/4d23fcb3-6c20-4387-b54f-a89d717bd134/full/843,/0/default.jpg)
