(1970). Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Appalachian and Michigan basins, Pennsylvania, Ohio, and Michigan / by Wallace De Witt, Jr.
Citace podle Chicago (17th ed.)Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Appalachian and Michigan Basins, Pennsylvania, Ohio, and Michigan / by Wallace De Witt, Jr. 1970.
Citace podle MLA (9th ed.)Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Appalachian and Michigan Basins, Pennsylvania, Ohio, and Michigan / by Wallace De Witt, Jr. 1970.
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