American
WLS XIII from White Line Squares (Series II)
Clipper Ship from Vista Series [trial proof]
WLS XV from White Line Squares (Series II)
WLS VI from White Line Squares (Series I)
Earth Day
Modern Print
River of Ponds I
, 1971
, 1972
![Clipper Ship from Vista Series [trial proof]](https://api.nga.gov/iiif/3e7deed6-f8e5-46ea-9c73-f7981f814031/full/843,/0/default.jpg)
![Delaware Crossing [color trial proof]](https://api.nga.gov/iiif/671ce331-d8cb-47c1-a606-594828a245d4/full/843,/0/default.jpg)
![Hinged Canvas [trial proof]](https://api.nga.gov/iiif/087635d2-317e-400b-9248-17a0efc212b4/full/843,/0/default.jpg)
![Leg and Chair [working proof]](https://api.nga.gov/iiif/9bb4f4d5-cf67-4231-9450-372dfefd233c/full/843,/0/default.jpg)
![Hinged Canvas [working proof]](https://api.nga.gov/iiif/055e0103-4f55-430d-a6ba-69251020d4d0/full/843,/0/default.jpg)
![Delaware Crossing [color trial proof]](https://api.nga.gov/iiif/e9a5612d-0efc-4b70-9b81-e99b1d2f5371/full/843,/0/default.jpg)
![Hinged Canvas [working proof]](https://api.nga.gov/iiif/5b33088c-1b2c-4997-8976-108b97ca48e8/full/843,/0/default.jpg)
![Leg and Chair [proof]](https://api.nga.gov/iiif/c21f156b-dee3-406e-89a6-4405ef6487c8/full/843,/0/default.jpg)
![Delaware Crossing [color trial proof]](https://api.nga.gov/iiif/6b380faa-3752-4b9a-b576-7e8a277615fc/full/843,/0/default.jpg)
![Delaware Crossing [color trial proof]](https://api.nga.gov/iiif/26731a48-174e-4989-af74-301c95760617/full/843,/0/default.jpg)
![Good Time Charley II [working proof]](https://api.nga.gov/iiif/d2476dd4-c214-4f0d-9d48-a28c47bad159/full/843,/0/default.jpg)
![Good Time Charley II [working proof]](https://api.nga.gov/iiif/3dae0827-111a-4367-ba7a-634e5a6fefa1/full/843,/0/default.jpg)
![Hinged Canvas [working proof]](https://api.nga.gov/iiif/a6ae14d2-058f-49b6-bdce-be6cd9b9cd0d/full/843,/0/default.jpg)
![Zone [trial proof 4]](https://api.nga.gov/iiif/abaee809-c64a-4efa-9539-97ab064e85d9/full/843,/0/default.jpg)
![Zone [working proof]](https://api.nga.gov/iiif/9c42b76d-c997-468c-aed0-01333e425774/full/843,/0/default.jpg)
![Zone [trial proof 1]](https://api.nga.gov/iiif/87df4b1f-8820-45c3-8926-a1dfca8b3aac/full/843,/0/default.jpg)
