Rolfe, Deette, 1879- <br/><br/>
The Rock River country of northern Illinois, 
by Deette Rolfe. 
 - Urbana, Ill.  [Springfield  Jeffersons Printing & Stationery Co.]  1929. 
 - [58], [1] p. incl. front.  illus., maps.  20 cm. 
<br/><br/> At head of title: State of Illinois.  Department of Registration and Education. 
<br/><br/>Bibliography: p. [59] 
<br/><br/><label>LCCN: </label>gs 29000068  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Illinois--Rock River Valley.
<br/><br/><label>LC Class. No.: </label>QE105  / .A3 no.2