Welles, Samuel P.,  1909-1997. <br/><br/>
A new species of elasmosaur from the Aptian of Colombia and a review of the Cretaceous plesiosaurs / 
By S.P. Welles. 
 - Berkeley ;  Los Angeles :  University of California Press,  1962. 
 - 89 p.  illus., 4 plates. ;  26 cm. 
 - University of California publications in geological sciences,  v. 44, no. 1 .
<br/><br/>Bibliography: p. 82-87. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plesiosauria.<br/>Paleontology--Cretaceous.<br/>Paleontology--Colombia.