Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1968: Issue 1294

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1970: Issue 1354

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1967: Issue 1274

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey: 1969, Issue 1324

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1975

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1975: Issue 1422, Part 1

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1973: Issue 1395, Part 1

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1971

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1974: Issue 1405

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1972: Issue 1394, Part 1

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1975: Issue 1422

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1974: Issue 1405, Part 1

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1973: Issue 1395

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1972: Issue 1394

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1973: Issue 1395

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1972: Issue 1394

Coal Resources of Michigan

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1964

Stratigraphic Nomenclature in Reports of the U.S. Geological Survey

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1965: Issue 1244