Winchell, N. H.  1839-1914. <br/><br/>
The history of geological surveys in Minnesota. 
By N. H. Winchell. 
 - St. Paul,  The Pioneer Press Co.,  1889. 
 - 37 p.  25 cm. 
<br/><br/><label>LCCN: </label>gs 06000019  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Minnesota.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Minnesota--Surveys.
<br/><br/><label>LC Class. No.: </label>QE127  / .A22 no. 1