1. The brachiopod genera Hebertella, Dalmanella, and Heterorthina from the Ordovician of Kentucky Author/Creator: Walker, Laurence G. 1937- (Laurence Graves), author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1982 Resource Type: Book Access & Availability: Loading
2. The brachiopod genera Hebertella, Dalmanella, and Heterorthina from the Ordovician of Kentucky : a taxonomic study of nine species and their stratigraphic distribution in the Lexington limestone and younger Ordovician rocks Author/Creator: Walker, Laurence G. 1937- (Laurence Graves) Publication/Creation: Washington : U.S. G.P.O., 1982 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 1066 A-N. Access & Availability: Loading