1964–1969
Patrons' Permanent Fund, 1928
Lee Friedlander, 1966
Patrons' Permanent Fund, 1976
Patrons' Permanent Fund, 1969
Patrons' Permanent Fund, 1852
Patrons' Permanent Fund, 1966
Lee Friedlander, 1972
Patrons' Permanent Fund, 1488
Patrons' Permanent Fund, 1975
Patrons' Permanent Fund, 1995
![Flagstones (a) [trial proof 2]](https://api.nga.gov/iiif/76074520-bf5e-4032-bec1-580b18de84a4/full/843,/0/default.jpg)
![Figure 4 [trial proof]](https://api.nga.gov/iiif/50648fee-98a6-4133-87fa-fbb3cb6e915a/full/843,/0/default.jpg)
![Passage I [working proof]](https://api.nga.gov/iiif/bb9593f8-22ca-4067-863b-8b8726c5acc6/full/843,/0/default.jpg)
![7 [trial proof, 2 plates]](https://api.nga.gov/iiif/33096efd-ed0f-4248-b9b0-2e5f58027985/full/843,/0/default.jpg)
![Figure 6 [color trial proof]](https://api.nga.gov/iiif/57ec32d2-ee51-4dd0-b369-ee69e962bee7/full/843,/0/default.jpg)
![Untitled (Purple Mezzotint) [trial proof D]](https://api.nga.gov/iiif/c4b3201c-9dc3-4c30-ab3c-5eec316c6c1f/full/843,/0/default.jpg)
