Great Lakes Dredge and Dock Co.
| Name | Great Lakes Dredge and Dock Co. |
|---|---|
| Vessel Owner For |  KEYSTONE STATE |
| City | Duluth |
| State | MN |
| Country | United States |
| Begin Date | 1956-00-00 |
| End Date | 1980-00-00 |
| Registry | U.S. |
| Official Number | 272733 |
| Name | Great Lakes Dredge and Dock Co. |
|---|---|
| Vessel Owner For | KEYSTONE STATE |
| City | Duluth |
| State | MN |
| Country | United States |
| Begin Date | 1956-00-00 |
| End Date | 1980-00-00 |
| Registry | U.S. |
| Official Number | 272733 |