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![](./images/clear.gif) 1.- BOUNDARY STRATOTYPE FOR THE BASE OF THE PENNSYLVANIAN SYSTEM, EAST-CENTRAL APPALACHIAN BASIN, U.S.A.;
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MADRID: I.G.M.E., 1985
CONGRES INTERNATIONAL DE STRATIGRAPHIE ET DE GEOLOGIE DU CARBONIFERE. 10/1983-09-12/MADRID
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