Douglass, Raymond C. <br/><br/>
The Foraminiferal genus Orbitolina in north America / 
by Raymond C. Douglass. 
 -- Washington :   United States Government Printing Office,   1960 
 - 52 p., [14] h. de lam. + 1 map. -- 
 (Geological Survey Professional Paper  ; 333).
<br/><br/><label>Subjects--Topical Terms: </label><br/>América del Norte<br/>Foraminíferos fósiles
<br/><br/><label>Universal Decimal Class. No.: </label>563.12(7)