Clarke, F. W. - Wheeler, W. C. <br/><br/>
The composition of crinoid skeletons. 

 - Washington  Government Printing Office  1914 
 - pp. 33-37 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA