Witt, Wallace de
Age of the Bedforf Shale, Berea Sandstone, and Sunbury Shale in the Appalachian and Michigan Basins, Pennsylvania, Ohio and Michigan / By Wallace de Witt. -- Washington : United States Government Printing Office, 1970 - 11 p. -- (Geological Survey Bulletin ; 1294-G).
Fecha real de registro 07-08-1970
Geología
Michigan
Ohio
Pennsylvania
55(748+771+774)
Age of the Bedforf Shale, Berea Sandstone, and Sunbury Shale in the Appalachian and Michigan Basins, Pennsylvania, Ohio and Michigan / By Wallace de Witt. -- Washington : United States Government Printing Office, 1970 - 11 p. -- (Geological Survey Bulletin ; 1294-G).
Fecha real de registro 07-08-1970
Geología
Michigan
Ohio
Pennsylvania
55(748+771+774)