1907
National Gallery of Art, 1663
National Gallery of Art, 1734
National Gallery of Art, 1884
National Gallery of Art, 1937
National Gallery of Art, 1941
National Gallery of Art, 1965
National Gallery of Art, 1808
National Gallery of Art, 1859
National Gallery of Art, 1936
National Gallery of Art, 1873
National Gallery of Art, 1617
National Gallery of Art, 1916
![The Scala Regia at the Vatican [reverse]](https://api.nga.gov/iiif/bfeb8a13-a240-4ee0-940a-6bc47454552c/full/843,/0/default.jpg)
![Zwei bezeichnete Skizzen (Two Sketches with Inscriptions) [p. 34]](https://api.nga.gov/iiif/9c8a6992-3f5f-4191-b28d-4650bd1c7270/full/843,/0/default.jpg)
