1941
National Gallery of Art, 1473
National Gallery of Art, 1937
National Gallery of Art, 1450
National Gallery of Art, 1516
National Gallery of Art, 1949
National Gallery of Art, 1960
National Gallery of Art, 1864
National Gallery of Art, 1935
National Gallery of Art, 1490
National Gallery of Art, 1958
National Gallery of Art, 1939
National Gallery of Art, 1572
![The Mass of Saint Gregory [recto]](https://api.nga.gov/iiif/4d23fcb3-6c20-4387-b54f-a89d717bd134/full/843,/0/default.jpg)
