Hedges, Lynn S. <br/><br/>
List of Widco logs run by State Geological Survey,  before March 1, 1964, 
compiled by Lynn S. Hedges. 
 - Vermillion,  Science Center, University of South Dakota,  1964. 
 - iii, 25 p.  map.  28 cm. 
 - South Dakota. State Geological Survey. Circular  no. 32 .
 - Circular (South Dakota Geological Survey) ;  no. 32. .
<br/><br/><label>LCCN: </label>gs 65000231  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Borings--South Dakota.
<br/><br/><label>LC Class. No.: </label>QE163  / .H415