1930–1939
National Gallery of Art, 1961
National Gallery of Art, 1800
National Gallery of Art, 1621
National Gallery of Art, 1944
National Gallery of Art, 1751
National Gallery of Art, 1610
National Gallery of Art, 1955
National Gallery of Art, 1951
National Gallery of Art, 1971
National Gallery of Art, 1515
National Gallery of Art, 1827
National Gallery of Art, 1852
![Entwurf zu "Vogelspiel" (Sketch for "Birdplay") [p. 31]](https://api.nga.gov/iiif/09dbd1de-8492-417e-8571-fe45ac9cd6c5/full/843,/0/default.jpg)
