1. Lithostratigraphy of upper Ordovician strata exposed in Kentucky Author/Creator: Weir, Gordon W. 1922-2011. (Gordon Whitney) Publication/Creation: Alexandria, VA : For sale by the Distribution Branch, Text Products Section, U.S. Geological Survey Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 1151 A-G. Access & Availability: Loading
2. Lithostratigraphy of upper Ordovician strata exposed in Kentucky Author/Creator: Weir, Gordon W. 1922-2011, (Gordon Whitney), author Publication/Creation: Washington : Department of the Interior, U.S. Geological Survey, 1984 Resource Type: Book Access & Availability: Loading