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1827 Virginie, Pensylvanie. Physical Atlas Carte des montagnes coupees par des rivi … |
1966 Folded Structure. Harrisburg, PA. Geolog … Physical Atlas Folded Structure. Harrisburg, PA. (oppos … |
1966 Folds. Loysvill, PA. Folded Mountains-Hu … Physical Atlas Folds. Loysvill, PA. Folded Mountains-Hu … |
1967 202. West Pennsylvania and Ohio. The Wor … World Atlas 202. West Pennsylvania and Ohio. The Wor … |
1967 205. United States of America, Middle At … World Atlas 205. United States of America, Middle At … |