APA

De Witt W., . (1970). Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Applachian and Michigan basins, Pennsylvania, Ohio and Michigan. Washington: U.S. Government Printing Office.

Chicago

De Witt Wallace, . 1970. Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Applachian and Michigan basins, Pennsylvania, Ohio and Michigan. Washington: U.S. Government Printing Office.

Harvard

De Witt W., . (1970). Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Applachian and Michigan basins, Pennsylvania, Ohio and Michigan. Washington: U.S. Government Printing Office.

MLA

De Witt Wallace, . Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Applachian and Michigan basins, Pennsylvania, Ohio and Michigan. Washington: U.S. Government Printing Office. 1970.