1886
National Gallery of Art, 1960
National Gallery of Art, 1936
National Gallery of Art, 1935
National Gallery of Art, 1914
National Gallery of Art, 1891
National Gallery of Art, 1895
National Gallery of Art, 1656
National Gallery of Art, 1490
National Gallery of Art, 1941
National Gallery of Art, 1888
![Skizze (Sketch) [p. 35]](https://api.nga.gov/iiif/7dce2688-d24d-447e-9ec8-1224d126df66/full/843,/0/default.jpg)
![The Mass of Saint Gregory [recto]](https://api.nga.gov/iiif/4d23fcb3-6c20-4387-b54f-a89d717bd134/full/843,/0/default.jpg)
