Condra, Geo. E.  1869-1958. <br/><br/>
Permo-Pennsylvanian section of the Hartville area of Wyoming, 
by G. E. Condra and E. C. Reed. 
 - [Lincoln]  Published by authority of the state of Nebraska,  1935. 
 - 46 p.  illus. 
<br/><br/> Cover title 
<br/><br/>Bibliographical foot-notes. 
<br/><br/><label>LCCN: </label>gs 36000025  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology, Stratigraphic--Permian.<br/>Geology, Stratigraphic--Pennsylvanian.<br/>Geology--Wyoming.
<br/><br/><label>LC Class. No.: </label>QE135  / .A43 no. 9