Annual Rings U.S.A./Canada boundary at Fort Kent, Maine and Clair, New Brunswick 1969. Schemata of annual rings severed by political boundary. Time: U.S.A. 1:30 pm; Canada 2:30 pm

Annual Rings U.S.A./Canada boundary at Fort Kent, Maine and Clair, New Brunswick 1969. Schemata of annual rings severed by political boundary. Time: U.S.A. 1:30 pm; Canada 2:30 pm