Keyes, Charles Rollin,  1864-1942. <br/><br/>
Terrainal differentiation of the Paleozoic succession / 
by Charles Keyes. 
 - Des Moines :  R. Henderson, state printer,  1915. 
 - [2 p.] :  1 fold. chart ;  25 cm. 
<br/><br/><label>LCCN: </label>gs 15000417  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Iowa.<br/>Geology, Stratigraphic.
<br/><br/><label>LC Class. No.: </label>QE654  / .K49