Andrews, George W.  1929- <br/><br/>
Early miocene nonmarine diatoms from the Pine Ridge area, Sioux County, Nebraska / 
by George W. Andrews. 
 -- Washington :   United States Government Printing Office,   1971 
 - 17 p., [2] h. de lam. -- 
 (Geological Survey Professional Paper  ;  683-E).
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estratigrafía<br/>Mioceno<br/>Nebraska
<br/><br/><label>Universal Decimal Class. No.: </label>551.782.1(782)