Sauer, Carl Ortwin,  1889- <br/><br/>
Geography of the upper Illinois Valley and history of development, 
by Carl Ortwin Sauer. Printed by authority of the state of Illinois. 
 - Urbana,  Illinois state geological survey, University of Illinois,  1916. 
 - 208 p.  fold. front., illus., fold. map, diagrs.  26 cm. 
 - Illinois. State geological survey. Bulletin  no. 27 .
 - Bulletin (Illinois State Geological Survey) ;  no. 27. .
<br/><br/><label>LCCN: </label>gs 17000080 //r88 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Illinois.
<br/><br/><label>LC Class. No.: </label>QE105  / .A16