Stratigraphic notes, 1989-90 : four short papers propose changes in stratigraphic nomenclature in Oregon, Vermont, Massachusetts and southern Pakistan.
Geological Survey (U.S.)
[Reston, Va.?] : Dept. of the Interior, U.S. Geological Survey ; Denver, Colo. : For sale by the Books and Open-File Reports Section, U.S. Geological Survey,
1991.
Geology, Stratigraphic
Geology, Stratigraphic