Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian Basin from Medina County, Ohio, through southwestern and south-central Pennsylvania to Hampshire County, West Virgina.  by Robert T. Ryder [and others]
Publisher: Dept. of the Interior
Place of publication: Washington
Language: eng
Number of pages: 32
Subjects: Geology - Appalachian Basin
Notes: 11