Correlation of stratigraphic units in North America. Northern Appalachian region correlation chart [map] / Douglas G. Patchen, Katharine Lee Avary, and Robert B. Erwin, coordinator
Includes text, notes, legend, "Column location map" and "COSUNA chart index map". Envelope title: Northern Appalachian region : correlation of strtigraphic units of North America (COSUNA) project.