1966–1967
Collectors Committee, 1992
Collectors Committee, 1969
Ellsworth Kelly, 1964
Irwin Hollander, 1967
Collectors Committee, 1956
Hollander Graphic Workshop, 1970
Collectors Committee, 2003
Ellsworth Kelly, 1983
Collectors Committee, 1981
Collectors Committee, 1991
Collectors Committee, 2000
![Eco del reloj [Clock Echo]](https://api.nga.gov/iiif/090d9aa1-ca72-4c49-8202-a0919ef133f2/full/843,/0/default.jpg)
