Coal Resources of Michigan

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, 1964

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

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, 1963: Issue 1194

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, 1964

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1963

Changes in Stratigraphic Nomenclature by the U.S. Geological Survey, 1966: Issue 1254

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

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, 1972: Issue 1394

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