Walker, Laurence G.  1937- <br/><br/>
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 / 
by Laurence G. Walker 
 - Washington, D.C :  United States Government Printing Office,  1982 
 - iii, 17 p., 5 p. of plates :  ill. ;  29 cm. 
 - Contributions to the Ordovician paleontology of Kentucky and nearby states Geological Survey professional paper ;  1066-M .
<br/><br/> Prepared in cooperation with the Commonwealth of Kentucky, University of Kentucky, Kentucky Geological Survey 
<br/><br/>Bibliography: p. 16-17 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hebertella<br/>Dalmanella<br/>Heterorthina<br/>Paleontology--Ordovician<br/>Paleontology--Kentucky<br/>Geology--Survey--Kentucky
<br/><br/><label>Dewey Class. No.: </label>564.8